What the funniest thing that has happened to you?

I was at Millenium Park in Chicago and my cousin, sister, and I had to go to the bathroom. We went in and someone thought it would be funny to put the girls sign on top of the guy sign so we walked in. I saw all those bathrooms were guys stand up and pee and i screamed "OH MY GOD!" and ran the hell out of there. It was sooo embarring.