Probability is funny

I'm taking a probability class, and I've learned some interesting things. For example:

A "random variable" is not random... and it's not a variable.
An "expected value" is quite often a value which you can't actually achieve (rolling 4.5 on a 6-sided die, for example).
The "compliment of success" sounds like a nice phrase, but it turns out the compliment of success is failure.

So much to learn!