About T-Shirt Design
If you like shirts that actually have some personality, I Love Halloween T-Shirt is a good example. Anyone who is into Halloween will probably understand the idea right away.
You could wear it for October events, bring it out for Halloween, or just keep it in the normal shirt rotation. People who buy t shirts for the joke as much as the shirt itself will probably get what this design is going for. It works well as a novelty t shirt because the joke is clear and the design has plenty of personality. It feels casual enough for normal days but still has enough personality to get noticed.