We've had the bed break once, although not so dramatically--it was on casters and one fell off. We were laughing so hard about the situation that the sex actually got forgotten. Nobody showed up, though.

We almost had a much worse break--we discovered that a screw was missing and part of the head was supported by perhaps 1/16" of wood. Had it slipped past that point it would have started to twist and ripped out the other screw (the screws weren't to take the weight, they were just to hold it in position.)

The first proper mattress we owned started squeaking badly within a few weeks (turns out the store had supplied a 4 wheel frame for a mattress that specifically required a 6 wheel type.)

To this day we occasionally joke about breaking beds.