Worst thing huh? Two for me.
1) The jerk who bullied me when I was 8 years old and chubby. When alone at his house, he would make to be my friend etc and then at the park or at parties he would get his goons together, make fun of me, hit me and yell "Fat alert! Fat alert!" and laugh when it made me cry. Loser
2) YOu wouldn't believe it after the above, but Usually guys are so sweet. One of these sweetie pie charmers I ended up pairing up with in the lab.
So I was working with this one idiot for a group presentation and he saved the our Power Point presentation onto a corrupt disk
we lost our work,, just about scrapped a pass and I've ignored him since. Would you belive his nerve? After the presentation disaster he asked me out! yeah riiiiight. I must admit I've been lucky so far not to have my heart broken at least