I go to a lot of pre-school activities, stay-and-play sort of things, or tumbletots or music groups etc. It's bad enough spending the majority of your waking life involved in persuits for the under-threes, but I just can't be doing with the unassailing stench of poo while I'm winding the bobbin up.
I tend to exclaim a cheery "Oh dear, someone needs a change" and proceed to check out my own children, hoping everyone else will then check the bottoms they are responsible for. If this does solve it I tend to twitter on "Hmm, not mine, ha ha, it usually is, I wonder whose turn it is this time..." until finally someone gets the hint and goes to change their stinky little darling's nappy.
The thing is, I get lots of faces when I do this, and "gosh your nose is good", said in an arch sort of way. Should I just be pretending that I don't mind the smell of shit while I'm drinking my tea and learning to throw a ball into a bucket of other balls?