Reasons for which you might need a 28-Led Ultraviolet Flashlight, which has a range of over 20 feet and runs on three AAA batteries:
A) You're a Crime Scene Investigator.
B) You need to validate money. Big money. Like those checks that they give out to Publishers' Clearing House winners.
C) "Scorpion Illumination, Scorpion hunting or avoidance"
D) That totally awesome black light paint you just smeared all over your room, man.
E) Checking for vampire bite marks.
and, of course, the "killer app" of UV flashlights:
F) "Find urine stains (i.e. at the hotel before you hop in bed!)"
Did we mention its bulb is unbreakable? There you go, then.
[via Shiny Shiny ]