7. Writing the answers minutely on water bottle stickers and caps
Stupid because: One could spend that much effort actually studying, or perhaps producing a piece of art.
8. The thighs have the answers
A girl in my school wrote the answers on her thighs and wore a skirt with tights underneath. She just had to stretch the material of her tights to see through.
Stupid because: She got caught while distracting several guys.