Humans often find puzzles and even questions irresistible.
Just try to walk by a TV playing a quiz show and not think about the answer to the question you heard walking by. How many times have you watched to the end of a movie you didn't particularly like, just because you had to find out how the story ends? Our legacy brains love curiosity because it usually means more learning.
You clicked on this post because I spelt courousity wrong?? LOL