When a conversation falls flat.
On Saturday just gone we had our daughter's belated birthday party at the local bowling alley. At the end the parents come to pick-up their kiddies. Anyway while the little'uns finished off their burgers and pizzas I usually have a chin-wag with the parents. So this one mother and I were chatting (nothing special, just general gibberish) and she mentioned that her car is going in next week to have a tow bar fitted, so I said: "What're ya looking for? a boat or a caravan?" She replied that next year they're looking for a boat. I quipped back: "Ah. Just as well, really. A caravan doesn't float too well." She turned and looked at me as if I'd grown an extra head.
The ma-in-law said my face had turned a little red. When I whispered what I told the mother she laughed like a drain.
Your stories when a chinwag goes flat.