politicians tend to go out of their way to avoid all contact with hats. notice how president obama admired the football helmet navy gave him. >> pretty sharp, huh? >> reporter: but declined to put it on. >> here's a general rule, you don't put stuff on your head if you're president. >> reporter: except that one time at a summit with tribal leaders. the hat lasted a mere ten seconds before obama tipped it off. and who can say no to girl scouts? the president ended up wearing a tejera, and there was that poncho former president bush got tangled up in? >> first sometime >> yeah. it looks like it, that's for sure. >> reporter: so ellen got him a new one with a presidential seal. sometimes a president just can't pass the hat. jeanne moos, cnn, new york. >> those ponchos are some of the most amusing.