Pick your poison:

Alice falls down the rabbit hole. Milo drives through the tollbooth. Dorothy is swept up in the tornado. Neo takes the red pill. Don’t tell us about another world you’ve imagined, heard about, or created. Rather, tell us about its portal.

or

Little pigs, French hens, a family of bears. Blind mice, musketeers, the Fates. Parts of an atom, laws of thought, a guideline for composition. Omne trium perfectum? Create your own group of threes, and describe why and how they fit together.

The answers to the following one would be insufferable:

How are apples and oranges supposed to be compared? Possible answers involve, but are not limited to, statistics, chemistry, physics, linguistics, and philosophy.

I think I saw this one on AskReddit:

“A man cannot be too careful in the choice of his enemies.” –Oscar Wilde. Othello and Iago. Dorothy and the Wicked Witch. Autobots and Decepticons. History and art are full of heroes and their enemies. Tell us about the relationship between you and your arch-nemesis (either real or imagined).

Another insufferable one:

Find x.

This is an AskReddit question:

How did you get caught? (Or not caught, as the case may be.)