Gromble Gags are the various things shouted by The Gromble during the show's opening. Entries marked with an * are repeated from previous episodes..
Season 1
- Episode 01: "Get down here!"
- Episode 02: "Lazy slimeballs!"
- Episode 03: "Just stow it!"
- Episode 04: "Fess up, slimeball!"
- Episode 05: "Get a Nielsen box!"
- Episode 06: "You blowhards!"
- Episode 07: "Not you again!"
- Episode 08: "I'll get you!"
- Episode 09: "That tears it!"
- Episode 10: "Lazy Slimeballs!"*
- Episode 11: "Wrong again!"
- Episode 12: "Rotten germheads!"
- Episode 13: Same as episode 12.* (However the closed caption reads "I'm outta here!")
Season 2
- Episode 01: "You all make me sick!"
- Episode 02: "You tire me out!"
- Episode 03: "Ickis you'll be snorched!"
- Episode 04: "Ickis where is it?!"
- Episode 05: "Where do you thing you're going?!"
- Episode 06: "Look human to me!"
- Episode 07: "Call me crazy!"
- Episode 08: "I can smell you from here!"
- Episode 09: "Wipe that smile off your face!"
- Episode 10: (unclear)
- Episode 11: "Move and you're dead!"
- Episode 12: "I can smell you from here!"*
- Episode 13: "Lazy slimeballs!"*
Season 3
- Episode 01: "Where do you thing you're going?!"*
- Episode 02: "Oblina, help me!"
- Episode 03: "Ickis you slob!"
- Episode 04: "Oly oly oxen free!"
- Episode 05: "Oh, hush up now!"
Season 4
- Episode 09: "Ickis your toast!"
- Episode 10: Same as episode 9.
- Episode 13: "Losers, it's all over!"