Take the logic test, devised by Colin Beckley and friends. The test is HERE.
There are actually two short tests, each out of 15. I got 15 for each one, and since I’m an illogical nutjob (so people in the blogosphere keep telling me) I’m sure you’ll all do much better!
EDIT: As Madeleine reminds me, a hat tip is in order! Thanks Mads. 🙂