Panel 2: SHE'S GOT HER HAIR DOWN! And I still know who she is! And she looks good -- and older! Which is fortunate, because she's back to asking babyish questions.
Panel 3: Well, that's actually pretty interesting. Although I'm sure there's a bit more to it than that: a trumpet is different from a French horn is different from a tuba, and all of them are different from those "Ricola" horns that are not bent at all. And I guess I'm supposed to be amused by April and Phil channeling Bill and Ted. Unfortunately, all I can think about is the amount of spit that accumulates in a brass instrument.
Panel 4: Uh, it looks like a beer bong. And April is way too excited.
Panel 5: Ah, jeez. Well, whatever it takes to stop 4-Evah whining. And to get April's hair down.