Prism Diffraction Glasses are awesome at night, plus they're cheap enough you can buy a bunch and give some away to make friends.

http://www.amazon.com/Fireworks-Glasses-Frames-Black-Light/dp/B00BMTZV6G/ref=sr_1_2?s=toys-and-games&ie=UTF8&qid=1396023101&sr=1-2&keywords=prism+diffraction+glasses