This, my friends, is a Leprechaun trap!
This is the first I have heard of it, but apparently in some areas it is traditional for children to make these traps as a craft project around St Patrick’s Day.
Obviously, everyone knows that if you catch a Leprechaun, they have magical powers and will grant you 3 wishes in exchange for their safe release. Sounds like a pretty good deal to me. Making a trap seems worth it.