About T-Shirt Design
If you like shirts that actually have some personality, And Then Satan Said, Put The Alphabet In Math T-Shirt is a good example. The science and nerd humor angle gives it a little extra personality without making the design too busy.
It works for work and birthdays, but it is also the kind of shirt someone could wear whenever they feel like it. If novelty t shirts are your thing, this one has a simple joke that is easy to wear. The design is easy to get, easy to gift, and easy to wear without overthinking it.