My friend has had this problem for a few months, possibly one of the addons he uses is going haywire and spamming his chat box with numbers all the time.
This is a list of all his addons he's using:
Code:_Corpse _NPCScan Acheron AckisRecipeList ActionBarSaver ACP ArkInventory ArkInventoryRules ArkInventoryRulesExample Atlas Atlas_Battlegrounds Atlas_DungeonLocs Atlas_OutdoorRaids Atlas_Transportation AtlasLoot AtlasLoot_BurningCrusade AtlasLoot_Cataclysm AtlasLoot_ClassicWoW AtlasLoot_Crafting AtlasLoot_Loader AtlasLoot_WorldEvents AtlasLoot_WrathoftheLichKing Atramedes Auc-Advanced Auc-Db Auc-Filter-Basic Auc-Filter-Outlier Auc-Match-Undercut Auc-ScanData Auc-Stat-Classic Auc-Stat-Debug Auc-Stat-Histogram Auc-Stat-iLevel Auc-Stat-Purchased Auc-Stat-Sales Auc-Stat-Simple Auc-Stat-StdDev Auc-Stat-WOWEcon Auc-Util-AHWindowControl Auc-Util-Appraiser Auc-Util-AskPrice Auc-Util-AutoMagic Auc-Util-CompactUI Auc-Util-EasyBuyout Auc-Util-FixAH Auc-Util-Glypher Auc-Util-GlypherPost Auc -Util-ItemSuggest Auc-Util-PriceLevel Auc-Util-ScanButton Auc-Util-ScanFinish Auc-Util-ScanProgress Auc-Util-ScanStart Auc-Util-SearchUI Auc-Util-SimpleAuction Auc-Util-VendMarkup AuriML AutoLagTolerance Babylonian Bartender4 Bazooka Bazooka_Options BeanCounter BigBrother BloodShieldTracker Broker_DurabilityInfo Broker_LFD Broker_TolBarad Broker_Cashflow Broker_Location BuffEnough Capping Collectinator CombustionHelper Configator Constructor Cromulent DBM-Sarth-ShadowFissureWarn Deadened DebugLib DispelBorder ElkBuffBars Enchantrix Enchantrix-Barker EnsidiaFails EpicGemList ErrorFilter !FixModSounds GFW_Linkerator FlightMap FriendsWithBenefits FuBar FuBar_RaidLog FuBar2Broker GatherMate2 GatherMate2_Data GemCounter Gladius GnomishVendorShrinker HeadCount HealOrganizer HealBot Healers-Have-To -Die Informant InspectFix LibAbacus-3.0 LibAboutPanel Ace2 Ace3 AceGUI-3.0-SharedMediaWidgets LibActionButton-1.0 LibBabble-Boss-3.0 LibBabble-Faction-3.0 LibBabble-Inventory-3.0 LibBabble-ItemSet-3.0 LibBabble-SubZone-3.0 LibBabble-Zone-3.0 LibBossIDs-1.0 CallbackHandler-1.0 ChatThrottleLib LibCrayon-3.0 LibDBIcon-1.0 Deformat DewdropLib DRData-1.0 LibDualSpec-1.0 LibFail-1.0 LibFail-2.0 FuBarPlugin-2.0 LibFuBarPlugin-3.0 LibGraph-2.0 LibGratuity-3.0 LibGroupTalents-1.0 LibJostle-3.0 LibAlts-1.0 LibDataBroker LibKeyBound-1.0 LibStub LibMapData-1.0 LibNameplate-1.0 LibPeriodicTable-3.1 LibQTip-1.0 LibQuickHealth-1.0 LibRockConfig-1.0 RosterLib LibSharedMedia-3.0 LibSimpleTimer-1.0 LibSink-2.0 SpecialEventsEmbed SpecialEvents-Aura-2.0 SpecialEvents-Bags-2.0 SpecialEvents-Equipped-2.0 SpecialEvents-LearnSpel l-2.0 SpecialEvents-Loot-1.0 SpecialEvents-Mail-2.0 SpecialEvents-Mount-2.0 SpecialEvents-Movement-2.0 LibStatLogic-1.2 TabletLib LibTalentQuery-1.0 LibTipHooker-1.1 LibTourist-3.0 LibWindow-1.1 LibExtraTip LoggerHead LoseControl MageNuggets Mapster MarkingBar Minimalist MovePowerBarAlt !nLog Omen OmniCC OmniCC_Config OPie Outfitter Overachiever Overachiever_Tabs Overachiever_Trade PhoenixStyle PhoenixStyleMod_CataMiniRaids PhoenixStyleMod_Firelands Postal PowerAuras PowerAurasButtons PowerAurasButtons_Config Prat-3.0 Prat-3.0_HighCPUUsageModules Prat-3.0_Libraries PyriteStacks Quartz RageBar RaidAchievement RaidAchievement_AchieveReminder RaidAchievement_CataHeroics RaidAchievement_CataRaids RaidAchievement_Icecrown RaidAchievement_Naxxramas RaidAchievement_Ulduar RaidAchievement_WotlkHeroics RatingBuster RealIDToons Recount ReforgedTooltip Reforgenator RSA RSA_Options RSA_Reminders RSA_DeathKnight RSA_Druid RSA_Hunter RSA_Mage RSA_Paladin RSA_Rogue RSA_Shaman RSA_Priest RSA_Warlock RSA_Warrior sct sct_options sctd sctd_options ShoutSwitcher SlideBar SmartTabTarget Squeenix !StopTheSpam Stubby !Swatter SwindlerPreventer Talented Talented_Inspect TellMeWhen TellMeWhen_Options LootLink TidyPlates TidyPlatesHub TidyPlates_Graphite TidyPlates_Grey TidyPlates_Neon TidyPlates_Quatre TidyPlates_CleanPlates TidyPlates_ThreatPlates TimeToDie TipHelper TipTac TipTacItemRef TipTacOptions TipTacTalents TwinValkyr_shieldmonitor unclefester UnobtrusiveCompactRaidManager Vamp VengeanceStatus Vigilant XPerl XPerl_ArcaneBar XPerl_CustomHighlight XPerl_Options XPerl_PartyPet XPerl_Party XPerl_P layerBuffs XPerl_PlayerPet XPerl_Player XPerl_RaidAdmin XPerl_RaidHelper XPerl_RaidMonitor XPerl_RaidPets XPerl_RaidFrames XPerl_TargetTarget XPerl_Target DBM-Core DBM-GUI DBM-BaradinHold DBM-BastionTwilight DBM-BlackTemple DBM-BlackwingDescent DBM-BWL DBM-ChamberOfAspects DBM-Coliseum DBM-EyeOfEternity DBM-Firelands DBM-Icecrown DBM-Karazhan DBM-MC DBM-Hyjal DBM-Naxx DBM-Onyxia DBM-Outlands DBM-Party-BC DBM-Party-Cataclysm DBM-Party-WotLK DBM-PvP DBM-AQ20 DBM-Serpentshrine DBM-Sunwell DBM-AQ40 DBM-TheEye DBM-ThroneFourWinds DBM-Ulduar DBM-VoA DBM-WorldEvents