In the mood to tickle your brain with a puzzle?
Have at it:
“Every blip is a blop. Half of all the bleeps are blops. Half of all the blops are blips. There are 30 bleeps and 20 blips. No bleep is a blip. How many blops are neither blips nor bleeps?” –Greenspun.com
(There is an actual answer to this teaser).