Yellow jacket nests the size of a car. I'd say that's perplexing.

Insect experts are baffled, as well as perplexed by the gigantic yellow jacket nests that are being discovered in "old barns, unoccupied houses, cars and underground cavities".

Or rather, gigantic nests of yellow jackets. When we get nests of gigantic yellow jackets I'm going to run screaming.