100. Seriously, Can You Tell Your Presidents Apart?
Who: Natalie Gulbis, Professional Golfer
Offending Tweet: @natalie_gulbis: "http://twitpic.com/xtkxz - Michelle and I with Lincoln Memorial in background"
Natalie got confused. You see, it was the Lincoln Monument that took the picture. He's got huge thumbs, but notice how he cropped the shot just right.