Muscle Enhancing Shirt
A shirt that shows off your bulging muscles - even if you don't have any! If you already do, awesome, they'll look even better! Hey, women have push up bras, dudes can have this.
Quite frankly, we're not sure if we'd wear this. I mean, it's pretty obvious that you're faking it, but then again it might work - especially if you wear another shirt over it.
But for $30, it's not a bad idea as something fun to try out. Perhaps a little social experiment to see if people react to your differently or notice your nice new muscles you acquired ever so quickly.