The Producers, Blazing Saddles and Holy Grail are my votes for the funniest movies of all time and the tallywhacker conference in Porkey's is my vote for the funniest scene (I think due to the close up of Ike that ends it.)
"Springtime,
for hitler
and Germany..."
The one thing I remember most about Porky's is creamed corn. Haven't been able to stomach the movie or the food ever since!