A scale.
or
Hot, because you can catch cold.
or
How dare you be so intolerant! So what if the light bulb has chosen an alternative light-style?
or
he said "Not you again".
or
A snail because it carries it's home.
or
Because pepper makes them sneeze
or
No one knows. Republicans automatically disbelieve him, and no one can ever trust a stinking liberal anyway.
or