Tip of the nutberg

The first clue that the person you are dealing with is a total whack job. Just as an iceberg is largely hidden below the water’s surface, the tip of the nutberg is a hint of the vast crazy hidden deep inside your typical head case.

Xavier: Did you see that old lady flip out when she thought we were laughing at her cat?

Emmett: Yeah, that was weird. I think we just saw the tip of the nutberg.