I clogged the toilet and it overflowed at an apartment I was sharing during a college internship. I panicked and yelled for my roommate. My roommate took care of it by toweling it all up, mopping, and such; I watched him do it all, horrified.

Afterwards I realized what a shitty thing it was for me to a) not clean it up myself and b) not even help. I grew up a lot that day.