One time my SR ran out of bullets when I was on the tower in Snow Valley, so I switched to my mines (only had one left) and threw it off the tower randomly...it landed right at the feet of someone coming up the hill, went off, and killed them...
Another time, on Junk Flea, I was going across the map and was hit by a flashbang...I kept running forward and started shooting randomly, and killed someone with a headshot even though I was completely blind still...and it was the kill that won the game for our team too...