Ninja Disguise Tshirt
If you see somebody wearing this God awful tshirt then whatever you do, do not ask them about their ninja disguise.
To do so is to set of in motion a sequence of events that is out of your control.
Upon being asked this question the wearer will smirk at you. Haul the bottom of their tshirt over their head and thus reveal the suprise.
That's right. By wearing the top in this fashion all is revealed, the inevitable trick up their sleeve: A ninja face that is printed on the inside of the tshirt.
As you shuffle away wondering what just happened, just one thing crosses your mind: If only I had a tshirt like that.