I have one that does this but it actually has the map on it tooo!

I totally posted this on Facebook!... @chelsiesparks have you seen the shirt that Universal sells that does this?!

What! No?! I need that shirt! Like asap.

Look! The ink is sun-sensitive,

I don't know why but the marauders map is like one of my favorite things from HP, so this makes me very happy!

I'm right there with you. The map and the Time Turner always amazed me.