I was travelling and thought I'd pray on a nice grassy lawn.

I got as far as sujud before realizing that the whole lawn was covered with rabbit poop.

I don't know what the "right" thing is to do in such a situation--I'm sure I can read up on fiqh and fatawi concerning putting your face into a pile of rabbit poop while you're trying to pray--but I immediately stopped praying and said something along the lines of: "Ew... gross... ach...... gross.................... ewwwwww........."