Ok, you want to talk about stupid?
I was playing a local 5 man in a middle beer can on the right tape. I was crossing down the inside of my bunker across the field when I saw a guy crawling from the center x with the flag to a dorito on their 40. I figured since he was going toward the other team he was on my team (I was playing with a couple people I had never played with before, so it wasn't like I knew everyone on my team). Just as he crawled into the dorito I realized that he wasn't any of our guys but it was too late. He was also the last guy on that tape, and ended up taking two guys on our left tape, which basically lost the game for us :-(