One of the stupid questions 'requested' by the US if flying a US carrier to the US from MUC was 'did you buy anything at the airport today?'

Since MUC is a shopper's paradise including the large mall in the central area and often outdoor markets, is one of the only places in the area to shop on a Sunday or holiday, and offers free parking with two hours of shopping, it really falls into the stupid question category.

Fortunately when I have responded in that fashion, they never pressed any further. Apparently they too know that the question does nothing to further security.