You see a boat filled with people. It has not sunk, but you do not see a single person on the boat when you look again. Why? (31/31)

Riddles like this brainteaser are tricky when they seem to encourage simple, rational reasoning. You might say something like “they all went below deck” or “jumped overboard.” However, you must concentrate on the term ‘single’ and consider its other meanings.

You can not see a single person on the boat as all the people were married.