One site of mine for a dance company used to get a ton of spam through 
contact forms. Everybody hated CAPTCHA, so I put a simple question with 
radio button choices:

A cow goes?
a. quack
b. woof
c. moo
d. chirp

VERY low tech, but believe it or not, we've not gotten a single piece of 
bot spam since!

Wouldn't advise this for most uses though...

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