About T-Shirt Design
CANCER T Shirt works because it sounds more like something a real person would say than a random slogan. It has a clear everyday humor vibe, which makes it easy to picture as a gift or something to wear for fun.
It makes sense for birthdays or holidays, especially if the person already likes this kind of humor. For a funny t shirt, it keeps things pretty straightforward and lets the saying carry the humor.
The graphic tee style keeps the whole thing casual and easy to understand. The joke is quick, the message is clear, and that is really all it needs.