I must have been about 20 weeks pregnant when I went to use the toilet in a friend's house. Walked in + the water was already up to toilet seat level, (they have two young dc's so one of them could have blocked the toilet somehow).
Anyway, I automatically flushed the chain thinking the water would go down (stupid pregnancy brain!!) It filled up, up + over the toilet seat, on to the floor + started seeping through the closed door into their hallway!!
I had to rush out + explain to my friend, I was extremely flustered by then! She didn't look too happy + we had to use an airing cupboard's worth of towels to stem the water flow, (had already started seeping into her living room!
Being the weekend her husband was home, he had to turn the water off + get down to the outside drain to see what the blockage was. All my friend kept asking me was had I flushed a sanitary towel down there! I was so embarrassed, of course I hadn't!
To make it worse her husband fished out something suspiciously long + white from the drain + they both just looked at me + at each other, shaking their heads!!
Anyway I offered to help clean up but they said no. Needless to say I cut my visit short + left!! This was several years ago + my friend still occasionally brings it up in conversation!!