About T-Shirt Design
One look at I'm Mom's Favorite T-Shirt and you pretty much know what kind of sense of humor it has. Anyone who is into family humor will probably understand the idea right away.
You could wear it for Mother's Day, bring it out for Christmas, or just keep it in the normal shirt rotation. It works well as a novelty t shirt because the joke is clear and the design has plenty of personality.
The joke is quick, the message is clear, and that is really all it needs.