A Monster
A monster is that thing you tell your parents is under your bed so you don't have to go to sleep. It's also that gross energy drink that makes you feel like you're on fire.
I told my dad there was a monster under my bed, and he just said, 'You're not getting out of bedtime.'
I drank a monster and my heart started beating like it was in a fight.
My brother drank a monster and ran around the house like a lunatic.