Okay, which anime scenes you think are deserving of the well know Wilhelm Scream?

In FLCL Episode 5 when Haruko is using her bass as a machine gun on Amaro and his men. I think a Wilhelm scream thrown in there would work nicely.

what is this wilhelm scream of which you speak?

i've never heard of a wilhelm scream before

The Wilhelm Scream is a highly popular scream effect used in a lot of movies, especially those from George Lucas. Search on Youtube if you wanna hear it.

As for me, a good anime scene choice would be in Kanokon ep. 1 when Kayura is blown away through a window by a fireball; either that or when, seconds later a chair lands on his crotch.