Near the end of the movie, after the Ghostbusters cross the streams that result in the gigantic explosion that burns the Sta-Puft Marshmellow Man up, the Ghostbusters emerge from the smoky ruins completely covered in marshmellow goo...except for Venkman (Bill Murray).

Why is that?

Was it perhaps because he got "slimed" earlier and he wasn't interested in getting the full treatment again? In other words, maybe it was the other guy's turns?

Anyone have any insight into this? Thanks.