For crying out loud!! IF you write that correctly it gets filtered out. I assume because it contains term for P@kistani that is not particularly nice. Where as I agree the F*** work and the C*** word should probably be filtered. Noone really uses the N or the P word without showing themselves up as a racist noob. How about changing the filters eh?
a prat is a bottom, so when you do a pratfall that's what you fall on. It can also mean a lady's front bottom, but you don't hear it much in that sense.