Now I'm really curious what's going on here, and what's her beef with Goldberg's gadget... Good set-up, though!

"A couple of years ago," the inventor reluctantly continued, "shortly after I moved to Ponyville, there was this thing with -- diaper changing." Light languidly pushed its way through the wince. "It's a long story. But I made something which solved it. An automatic diaper-changer. No mouth contact or corona work required. And in order to demonstrate it properly, without having to ask anypony for the --" another wince "-- loan of their foal... I scaled it up to work on adults. And used myself as the test subject, in a public demonstration. It worked perfectly."

i think i remember that, in "Diaper Pale", but i thought it went badly...

He probably has to be driving the whole thing, huh?