Have a few sex stories, but this one still makes me giggle.
An ex and I were doing the thing in my bed, when about 1/4 of a mile up the road someone had left a piece of unstable equipment on a farm-yard while looking for iron deposits (or something of the sort). there was a ground-shaking explosion (we had no idea what it was at the time) and my ex just looked at me and said 'well... you do make the ground shake!' we finished up before going to investigate.
P.S. a few animals were harmed in the making of this anecdote. By the explosion, of cour- oh shush.