Future teeshirt empire:
Manatees: everyone's favorite sea cow.
Manna Tees: everyone's favorite Jewish snack item!
There's even a double pun, after the 'more cowbell' teeshirt that is way too ubiquitous online.
I totally call a part of the profits on this shirt, should it ever be made. Copyright 2009 Midnight Shoveler Shirts, y'all! Perhaps it could even be made out of manna, like organic cotton teeshirts. Useful during fasts, and late-night snack binges. Do not attempt washing.