Having suffered a short tenure of a few month's employ at a South Jersey Dunkin' Donuts way back when, I learned a thing or too about the doughnut making process...for all the good it would do me later in life! Anyway, when the jelly donuts come down the line, you grab one in each hand, and there's a machine with two metal prongs extending from it...so you insert a prong into each donut and the jelly is squirted inside! Make of it what you will! and I know you will!
Well, considering that a bit of cream is always poking out of that hole...