Q: What is conditional probability?
A: Maybe, maybe not.
Q: What is a random variable?
A: Someone with multiple personalities.
Q: What is a discrete random variable?
A: It is a person that hides in the corner at parties. Similar to the wall flower but a bit more unpredictable after a few drinks.
Note: Thanks to M.T. (WWU) for sharing this book of unfortunate humor.
Source: R. Benson's F in Exams. 2011.