"The Problem With Popplers" is a very good episode. It used to rank in my top-10 (that was before I saw season 3 and 4).
It's one those shows that just makes you laugh 'til you puke the first time you watch it, and still holds up pretty nice on repeated viewing.
The pace is fast, the plot is pretty straightforward (or so you think until the twist with the Omicronians), the jokes are hillarious and the supporting characters are very strong.
I like Free Waterfall Jr. in this. He's excellent: "You can't own property, maaaan!", "I said: dooooo it!" and who can beat is argumenting tactic: "shut-up-shut-up-shut-up-shut-up-shut-up-shut-up-shut-up..."
The Zapper and Kif are always a hit, the negotiation scene is pure genius. "Hey, these would be great with kwak-a-mole. Stop eating our young! And it's pronounced quacamolé!"
The highlight of the show however is when Lrr eats Free Waterfall Jr. That scene made me laugh so hard, I thought I would burst. "Dude, my hands are huuuuuge! They can touch anything, but themself. Oh, wait...."
Other highlights include: The Roddenberry homage, Zoidy's penguin nest line, the tofu lion, the fingerlicking scene, "The Poppler Jingle", the second crashing of a billboard, pretty much anything involving Free Waterfall Jr. the Zapper or Lrr, finally hearing Leela's first name on the air, Fishy Joe.
"Go consumate yourself!"
"Og, great! Captain Moron have a plan! Why don't you tell it to Winkus and Dinkus over here."
"They're tastier than an unguarded penguins nest."
"It's like sex, except I'm having it."
"We seem to be experiencing some technical difficulties....and crap like I've never seen before!"
"Turanga!? That's her name Phillip. Phillip!!?"
"You shouldn't eat anything that can feel pain. Ouch! Okay, we wont eat you then."
Okay, there's loads more, but I'll stop here.
Final verdict: 9/10.