The Powerpuff Girls, Season 4

[After the girls solve the fifth riddle, which ironically, took place during the commercial break. The girls are panting from exhaustion as Him licks an ice cream]

Him:
[effeminate] I can't believe you got that one right! [resumes licking] You got the right flavor and everything! [resumes licking]

Blossom:
We'd go to the ends of the Earth for the Professor!

Him:
[demonic] Touching. [effeminate] Now here's something I hope you'll really enjoy!

[Two Ms. Keanes are tied in a rope, hanging on top of a vat of boiling sharks]

Powerpuff Girls:
Ms. Keane!

Him:
Yes'm! The real Ms. Keane will tell you the truth. The fake one will tell you a lie. Discover which is your beloved teacher and she'll be saved. Fail, and they both will be dropped into this vat of boiling sharks.

Ms. Keanes:
Girls, help!

Him:
You may ask them only one question. So make it count! [demonic] 45 seconds! Go!

Bubbles:
This one's easy! All we have to do is ask which one is the real Ms. Keane.

Blossom:
Not quite, Bubbles. The one that lies will just tell us she's the real Ms. Keane.

Buttercup:
Yeah, don't be stupid, Bubbles. I'll just ask which one wants a knuckle sandwich!

Blossom:
Same problem, Buttercup. We need a question they'll have to answer differently.

Bubbles:
I know, I know! Let's ask what their favorite color is.

Buttercup:
And just where will that get us?

Bubbles:
I bet it'd be nice to know.

Him:
[effeminate] Not so easy, is it? Time's running out.

Blossom:
Ooh, ooh! I know, I know! Ms. Keanes... who will the other Ms. Keane say is the real Ms. Keane?

[The two Keanes exchange a nervous glance]

Keane 2:
She would say that I was the real Ms. Keane!

Keane 1:
And she would say that she was the real Ms. Keane!

Blossom:
It's so apparent! It's obvious that the liar would say that the real Ms. Keane would say that the fake Ms. Keane is the real Ms. Keane. And conversely, the real Ms. Keane would say that the fake Ms. Keane would say she is the real Ms. Keane. So therefore, the real Ms. Keane is none other than... number two! [Bubbles and Buttercup look at Him who is stunned]

Him:
[shrugs] She's right.