Fun Stuff to do with BR?

Hi, I've heard about alot of fun stuff that people can do with br but no ones ever really gone into detail and seeing as i just ordered my first br, i would love it if you guys just posted intresting stuff you've done and what materials you need. Thanks

The floor tiles in my house are UV-reactive so when it's dark I can "draw" on them with my 405nm laser and they continue to glow for a second or two afterwords, it's really cool.