Thank you for giving me a compelling reason to try this. I have a stash of IR LEDs lying about and I've been intending to experiment with and IR-decorated hat for a good while now, but basically been too lazy. Now I have to try it!
Depending on your stash, why stopping at the hat? You can go full body IR and with a good IR-sensible camera you can achieve some nice (and fake and youtube-clicky) "poltergeist" videos!
You're gonna notice security guards following you while talking on the radio the minute you turn it on, but God bless you.