Not the last awesome thing Krillin does, but certainly one of the most memorable, is when he chooses to stand up against all 4 of the remaining Saibamen in Yamchas honor. And he isn't making an empty threat. Krillin stands on business and it's awesome.
I'm rewatching the original broadcast of DBZ for the first time in a VERY long time and I thought I'd express some of my thoughts as I watch! Stay Tuned!