Would you like to cause your friend to take a great big turd in his shorts? These Rorschach masks, if I'm to believe what I'm seeing on the video, are built specifically to do just that. Made famous by Jackie Earle Haley playing Rorschach in the movie Watchmen, and based off of the Rorschach ink blot test, these masks are pretty brilliant. Warm breath fades the ink to transparent, and then cool air darkens it to produce a moving effect. And according to Rorschach maskermind (thank you) Russell McCrory, the ink won't even kill you!
The fabric selected for the masks allows clear vision and breathing. Always a plus. They come in 5 different Rorschach ink blot variations.
October 2014 Update: Though these Rorschach mask designs are the maker's original pieces, he had to discontinue their production at the behest of Warner Bros. and trademark infringement claims. Sorry, dudes.