If you sit down and a cream pie is the top of whatever stack of items is beneath you, it produces a “Splat! You sit on a cream pie!” message and destroys the pie.

Getting hit in the head by a gush of water from a rust trap, or being immersed in water, immediately removes any cream pie on your face.

If you have egg on your face, your Charisma is temporarily and sharply reduced, lasting until either you get hit by or immersed in water or #wipe with a towel. This could also apply to having cream pie on your face.

A possible addition is for monsters to throw random (non-cockatrice) eggs at you.

Another possible addition is to add a new “egg trap”, which fires eggs at you with the intention of getting egg on you.