Not necessarily weirdest thing I've done, but weirdest thing happened...
Went to the bookstore to buy a book a friend recommended (I think it was The Thirteenth Tale) and sat down in a chair in the children's department to skim through it. After a couple minutes, a kid came up to me, stood 2 feet away, and just STARED at me. That was weird, but weirder still, over the next five minutes, there were four more kids... all standing in a semi-cricle and staring. None of them were even related.
I got up to buy the book, and they all followed in a line. Finally, I just walked around the whole store until parents eventually saw their kid, and dragged them away apologizing. oO I still have NO idea why those kids were so... intent on staring and following xD Never happened before/since then, and no, I do not look particularly deviant from the average individual.