well I started by just staring...then nearly vomiting...then hysterical laughter when I realised I had to problem solve and fast.
DS never did so when DD did it it was my first experence.
I pulled the plug and then turned the shower on an washed off DD.
Then realised she has way too many bath toys and threw them all out
If it hadnt have been an explosive poo I probably would have handled it a bit better