Doppelgänger did a bunch of parody t-shirts for sale on venues like Amazon and boutique shops.  I did quite a few designs for them.  They were all meant to be simple, cheap, and easy to produce.  Just a bunch of silly and goofy jokes that people like to wear.  Especially dads, dad jokes were always a plus.  I’m a dad, and an expert at dad jokes, so it was a win-win.