When one of the boys leaves the toilet seat up after he uses the bathroom, an unspeakable tragedy occurs.

Cartman launches his own gem shopping channel.

The kids are in danger when new trends start to evolve and shift at a rapid pace.

The town's big Easter Egg Hunt is in jeopardy when Cartman produces video evidence of a mysterious creature lurking in the woods.

Butters is the victim of an unlikely bully.

The boys' ziplining adventure becomes a terrifying test of survival.

The time has finally come for Cartman to let a special someone know exactly how he feels.

South Park Elementary takes steps to address football's concussion crisis.

Cartman finally admits he's fat and immediately gets a mobility scooter.

Cartman signs up for a home security system.

The boys drop in on the Republican Debate and pull off a large scale "Hilling".

The class watches an educational film on the deadly consequences of memeing.

After making headlines, the boys learn that their meme of choice is no longer in style.

The boys refuse to let "Swifting" replace their favorite meme.

Professor Lamont steps up his lessons about the dangers of memeing.

After seeing evidence of a shocking new meme, Professor Lamont learns that cats are evolving.

Cartman confronts Mr. Kitty about posting "Breading" pictures online, while Kenny has second thoughts about "Hilling".

Two teens are killed doing a new internet meme, which was started by a cat.

Stan goes behind the other boys' backs to try out a new meme.

Professor Lamont confronts the cat responsible for the new meme, while another memer dies "Reporting".