I need some ideas for Common Beliefs for a science project,any ideas?

Question

Example: If a dog eats grass does that mean rain? or If you measure your elbow to your wrist is that how big your foot is?

Answer 1

"When birds eat rice thrown at weddings, when they drink water right afterwards, the rice expands and the birds explode."
"People can receive radio signals through the fillings of their teeth."
"Cows laying down means rain."
"The whiter the bread, the sooner you are dead."
"if you make that face again, your face will freeze."
"If you drink nothing but sugar sodas, your teeth will rot."
To name a few.