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Tangent
Not much of a punchline, more like my favorite factoid about tangent. But I'm out of practice! Give me a minute.
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XKCD Guide to Notation
Somehow had never seen this.
Wheels Within Wheels
Mathober Day 17: Wheel
Wheels are graphs with a central hub vertex, connected to all other vertices, which then form an n-1 cycle. My favorite thing about them is that there are n^2-3n+3 n-1 cycles on an n-wheel.
Unless of course you're spending all your time looking for the cursed number. Pheh, mathematicians.
XKCD, of course.
Bigger Fractions
Sunil Singh posted the top image, so I had to...