If you're a fan of the internet giant Reddit, then this shirt is without a doubt a must have. If you're not aware of Reddit, however, you should probably keep it that way. You'll live a happier life in the long run. Trust me.
The shirt featured below isn't quite as up to snuff as the one Sheldon sports, but it suffices.
Featured on The Big Bang Theory episodes
S05 E04: "The Wiggly Finger Catalyst"
S05 E16: "The Vacation Solution"