Ah, the Zen things a mathematician sees. This is for today:
a non-zero zero
This is less insane than it sounds like, as in maths a zero is, in addition to the number (0), a name for any point x in which a function gets the value zero: 2 is a zero of the function 
That’s a non-zero zero, while to that function zero is not a zero.
Oy vey.
And this has been a yet another part of my attempts to explain Tom Lehrer’s comment of “Some of you may have had occasion to run into mathematicians and to wonder therefore: How they got that way?”
Maybe this will help:
