I need a statistical problem where the answer is 40.?

Question

This is part of a birthday gag and three of the folks involved are psychometricians. It doesn't have to be extremely complex. But it should be more challenging than something a first year student would get.

Answer 1

What is the median of these four numbers:

1, 2, 38,  42, 168, 1056?

And, you must discern the answer in your head.

The answer is the average of the two middle numbers, which is 40.