(Biff prepares a smoke bomb concoction while wearing a clothespin on his nose)
Biff: Old sneakers.
(Bull gives him his old sneakers to add to the concoction)
Biff: Old socks.
(Bull gives him his old socks to add to the concoction)
Biff: R-r-rotten broccoli!
(Bull just stands there, grossed out)
Biff: I said, "rotten broccoli"! HEY! I told you to wear one a' these, ya dope!
(he hands Bull a clothespin to put on his nose)
Biff: Now, rotten broccoli.
Bull: It's so gross.
(he gives Biff the broccoli)
Biff: Well, of course it's gross. It's supposed ta' be gross.
(he adds the broccoli to the concoction)
Biff: When this stink bomb goes off at that talent show, those jewels are gonna be ours!
(he and Bull laugh and finish preparing the smoke bomb)