You don’t often expect to find mathematics and humour in the same title sentence but the following cartoon from xkcd allows me to make the exception in this case :

The tagline from the site is equally amusing especially when you imagine what liberal arts majors may or may not be studying :

Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).

Plenty more to see over there – as an engineer, the following appeals to me :