Niles: All these years, it's been our secret shame.
Frasier: Yes, and it hasn't been easy concealing it, either. People are always saying in conversation "It's just like riding a bike." I can smile, and nod. But I only understand it in theory.

Roz: I'm on my way to meet Alice and her sitter. Alice wants to practice riding her bicycle for Saturday.
Frasier: Really?
Roz: Mmm-hmm, she loves it. I mean, she had that bike one day before she made me take her training wheels off.
Frasier: Tell me, does she ever find that she feels as though her feet are frozen to the pedals? Stuck in a confused, arrhythmic battle between forward and reverse, until finally, with no locomotive momentum whatsoever, she keels over like a felled tree?
Roz: I don't think so.
Frasier: Well good, good. Because... that's a real thing that happens to some kids.

Niles: I don't have time for that. Daphne wants to go biking tomorrow afternoon.
Frasier: Well, then you're just going to have to tell her that you don't know how to ride.
Niles: I can't. It's too late. If I was going to do that, I should have done it at the bike store. But no! You, you said we could teach ourselves! You said no one would be the wiser!
Frasier: Niles.
Niles: "Two bouncy tires and a taut chain" you said!
Frasier: Niles...
Niles: And now look! My spokes are bent, my pants are stuck, and there's blood on the headlight, and blood everywhere!
Frasier: Niles, that wasn't your fault. That jogger should have been wearing a reflective vest.