Last fall when I had my deck torn down and rebuilt as a porch, they tore down the drywall inside and discoverd a pretty large yellow jacket nest, gave the workers quite a bit of a surprise.
Thankfully, I had sprayed the little hole outside where I thought they had a small next in a light fixture, and it had been enough to discourage them into leaving. Nothing like turning a few hundred angry yellow jackets loose in one's house to create bedlam. I'm a bit allergic to them now, also, probably an indirect result of being stung by fire ants a dozen years ago.
I ran over a yellow-jacket nest with a push mower a few years back, not much fun. Got stung five or six times before I ran away and killed the ones on me.
