(Gabrielle has to jump to a moving chariot from Xena's horse)
Gabrielle: Are you crazy?
Gabrielle: If I die I'm never talking to you again!
(a short while later)
Xena: You call that a jump?
Gabrielle: No, it was a frantic leap. Best I could do.
The whole "baby-throwing" sequence from "Cradle of Hope". Made even funnier by the fact that, rather than wailing in fear, the baby is giggling the whole time.
The pre-opening credits sequence from "The Path Not Taken", in which Xena casually punches out several drunken, violent bar patrons one at a time, presumably without Gabrielle noticing a thing. Then Xena finally uses her alchohol-plus-flaming-torch flamethrower trick on another, causing an entire table of patrons to hastily exit. Then:
Gabrielle: Did you ever notice that we never have a problem getting a table?
Xena: It's a mystery to me.
From "The Furies":
Xena: I am a lunatic with lethal combat skills.
Xena:(mounting Argo backwards) Gooooo horsey!
"The Quill is Mightier...":
Barbarian Leader: We fight with the heart of a lion!
Aphrodite: And you run with the feet of a chicken.
During a brief lull in some violence, Gabrielle and Ares actually begin to talk and, purely by accident, start making light hearted jokes about their past dealings with each other, before both wising up and bringing the conversation to a screeching halt.
Ares: We were starting to... warm up to each other there, weren't we?
Charon: Oh, ‘I know something's gone wrong on the other side.' You can say that again. We've got everything turned upside down. All the wicked are in the Elysian Fields. All the good guys are in Tartarus. And now, we've got tourists.
Charon: Alright, that is it. I'm drawing the line here. Someone has to. So, I'm not taking either of you across unless you've got a gold coin. Now, there will be no exceptions, no bargains, no compromises, and absolutely no deals -
(Xena holds up Hades' Helmet of Invisibility)
Charon: ...Welcome aboard. Hope you have a great time. Please make yourself comfortable. Keep your hands inside of the boat. (Xena and Marcus board the boat) Now, looking to the left, you will see the caves of distress, and just ahead, coming up on the right, you will see the hanging garden of disgusting disease.
"Hooves & Harlots" when Xena and Ephiny find out the war between Amazons and Centaurs is provoked by someone else by investigating an ambush.
Ephiny: (picks up horse dropping) These contain raw hay stalks. Centaurs don't eat hay.
Xena: Actually I was referring to the hoof prints. Centaurs put their weight on their front legs.
"Amphipolis Under Siege" is a serious episode but it has its moments thanks to Ares and Xena's ongoing antagonism.
Ares: Don't feel bad. After all, you are fighting the goddess of wisdom and warfare.
Xena: Don't forget weaving.
As well as Xena's mother walking in on Ares and Xena and remarking that if she was to end up with a god she expected it to be Hermes. Ares wasn't amused.
Ares: How goes the siege?
Athena: I'm about to start catapulting dead cows into the village.
Ares: And a classic it is.
Xena organizing a jail break in "The Black Wolf".
Salmoneus: All right, I got 15 belts, 6 shirts and 3 propositions. This work is disgusting.
Gabrielle trying to imitate Xena's moves for a major Epic Fail. When she tries to use a bowl like the chakram, it bounces and smacks her in the face. When she tries to use the Pressure Point move on a guard, it has no effect and the guard punches her out while she's giving the, "I've just cut off the flow of blood to your brain. You'll be dead in thirty seconds..." speech.
"Purity" had the one where Gabrielle had to use Joxer's black powder to escape their stocks. It was in his pocket so she had to reach in there with her toes...
Gabrielle: Remind me to cut off my foot later.
Xena's reaction to her pregnancy in "Animal Attraction".
Xena: If you weren't such a quack you'd know that getting pregnant requires certain physical requirements that I haven't met in a long time. And I mean a very long time. No one, zilch, zippo. I am a love-free zone so it is impossible for me to be up the duff. So what's your diagnosis now?
Doctor: Mood swings!
Leah bemoaning Xena and Gabrielle's lack of virginity in "Warrior, Priestess, Tramp".
Gabrielle: I was married at the time.
Leah: Yes, well, we all have our excuses don't we?
Gabrielle: (Xena smirks and Gab turns to her) Were you?
The various Contrived Coincidences that ultimately result in Gabrielle being faced with three Lucy Lawlesses all dressed identically.
From "A Royal Couple of Thieves":
Autolycus: Ha ha ha, you're trying to use my ego against me.
Gabrielle: I didn't think it would work.
Autolycus: No, it worked. I'll do it.
"The Quest". Awkwardness ensued after Xena (in Autolycus' body) kissed Gabrielle.
Atolycus: "Well, I hope you two worked things out".
"The Royal Couple of Thieves". Autolycus is confronted by Xena (Meg in armor) after stealing a ruby.
''"It's just a little ruby, no one's gonna notice."
"The ruby, it's gone!"
"Oh, all right!" (throws it back)
"The ruby, it's back!"
Xena stuck in a "Groundhog Day" Loop. Her frustration keeps mounting until she throws her chakram right into Joxer's chest during one of his wake up calls. And then there's the bit where she's revealed the situation to Gabrielle and Joxer so many times that she's memorized every suggestion they make.
"No, No, Yes, No, I tried that, yes both ways, no, I don't know, no again, are there any more questions? Good."
There's also her epic temper tantrum after she thought she FINALLY made peace in the village, complete with kicking her feet in frustration.