My last pug ever was in heroic deadmines.
Our first tank just vanished 10 seconds after the group had been formed, stating "Fail group, priest healer". I don't quite know what he was on, because that was way after holy concentration had been buffed, and I was in pretty great gear. But whatever, I just found that funny at that point.
Our second tank left without a word after the first pull, as it lasted 6 minutes. The DPS was horrible, top DPSer pulling around half the DPS of the tank. I was about to agree with the tank, but - it's though to just abandon people. Luckily, one of the dpsers left as well, and we got in a good warlock who did more DPS than the rest of the group combined. So DPS turned bearable as a result.
The third tank was insanely impatient, chainpulling everything. I blew no less than 8 manapots and all cooldowns on the remaining trash leading up to the first boss, screaming and yelling for a manabreak along the way. Along the way I lost the group rogue due to not being able to afford a flash heal. It was really his own fault from eating all those cleaves, but that didn't stop him fro giving me a massive tirade about how much I sucked. Let's just say that I was steaming at that point, and gave the tank a tirade about healers needing mana to heal, especially when there is no CC. His response was that I needed to STFU and heal more, he couldn't be arsed to look at my manabar.
First boss was jinxy. The rogue kept on eating damage and eventually died. Again. He was less than pleased. But we downed him, mostly due to the wonderful dps from the warlock.
The tank was really impatient at that point since it by his standards was obviously going slow, so he
set up the pace. After chainpulling the third pull when I was at zero mana and no cooldowns, I simply let him die, a move which kida killed the rest of the group as a consequence. I apologized to the rest of the group and let the tank know why. He just left. Rogue was immediately on my back berating me about "costing us
another tank". I told him to try to outdps the next tank, I was pretty upset by then.
Fourth tank came, and ... didn't really know how to play at all. I have never had troubles with healing aggro until that point. After tanking more adds than the tank while desperately spamming binding heal, I died. Cursing silently, I released and ran. The group somehow managed to down the pull. And then they went on pulling the next one. Without me. With natural consequences. A complete wipe. Warlock left.
I have never been told meaner words than on that day. And it marked the end of the group and my pugging career. It wasn't the first bad run I had seen, I believe it was the sixth in a row.