Ok, lets get this thread back on the serious side for some time.
Someone asked how it is possible that Saiyans went trough countless battles being unbeatable in Great Ape form, but as soon as they arrive on Earth they start loosing their tails one after another. CBA to go through all this silly stuff that went on for last few pages to find it.
Anyway, the reason is simple - no one before Goku's friends knew about Saiyans loosing strength when someone grabs their tail.
This is where Yamcha truely shined in the entire Dragonball series, he thought: if Goku is loosing his strength when his tail is grabbed, why not try to cut it when he's raging in Great Ape form - maybe he'll pass out. Turned out it was a good idea, as he immediately turned back.
After that, it was obvious: Saiyan turning Great Ape - cut his tail.