Mickey, Donald, and Goof's first day on the job as Musketeers.
Mickey: This is it guys, when these doors open, we got to make a very first impression. (Donald stands, Goofy licks hair, then stands) Okay guys, we're on duty, and this place will be crawling with bad guys.
Donald: Bad guys?
Mickey: (seriously) So, stay alert!
Donald: (to Goofy) You heard him! Stay alert!
Goofy: Aye-aye sir! (looks around, sees a suit of armor with an ax) Bad guy! No! Whoa!
The first thing Mickey, Donald, and Goofy do when they see Daisy holding a butter knife? They jump her assuming that she's trying to attack the queen... with a butter knife.
"I can't hear nothin' but step-clop. step-clop, step-clop."
When one of the Beagle Brothers tells the other Beagle Brother to "have a gander at Monstro's better side" (they're both peering through a keyhole at Shorty and Peg-Leg Pete), that Beagle Brother takes a turn peering through the keyhole only to find Pete peering right back at them, before Pete reaches through the keyhole and pulls them into the room.
The entire fight scene in the opera house set to Gilbert and Sullivan.