Is that cake batter as the green slime? Another fun idea would be to act like it was paint and someone brush or roller it all over you then dump it all over you like they would do on the 3 stooges
love the fact there's nothing he can do to stop you from throwing pies in his face and he's at your mercy. Also love seeing and hearing the pies explode on his face
Try crumbling some saltine crackers on the bottom of the plate then put your pie filling over the crackers. Doing this first all the pie with stay on your face and the plate will be mostly clean and the crackers will stick to your face like a crust then slowly side down your face