dunderhead (noun)

1. In the comics, the dunderhead character is always getting into laughable misadventures.

2. The horror movie featured a dunderhead who repeatedly made foolish decisions, leading to his demise.

3. Why did the dunderhead bring a ladder to the bar? He heard the drinks were on the house!

4. In the fantasy novel, the dunderhead was the unlikely hero who stumbled upon the magical artifact.