Rule 34
Rule 34
Cueball: Huh-- Thomas the Tank Engine slash fiction. Megan: It's rule 34 of the internet. If you can imagine it, there is porn of it. Cueball: Nah. The web is freaky, but it can't begin to have everything. Cueball: There's no porn set atop storm-chasing vans. No homoerotic spelling bees. No women playing electric guitar in the shower. Megan: Actually, that last one would look pretty hot. As long as they were unplugged or waterproofed... Megan: Rivulets of water run down her chest, the smooth body of the guitar firm against her hips. Megan: She twangs the E-string and it shakes off tiny droplets in all directions. [She rises into a crouch.] Megan: You're sure it doesn't exist? Cueball: Not yet. Megan: I'm registering WetRiffs.com. Let's get on this.

Cueball is rather surprised to find slash fiction (same-sex erotic fiction featuring characters from popular media, often from unrelated series) featuring characters from the Thomas the Tank Engine television series, but Megan isn't remotely surprised, citing Rule 34 : "If it exists, there is porn of it. No exceptions."
Cueball denies the truism of the rule, coming up with several examples of porn that doesn't exist yet, until he comes across one that they both agree would be pretty hot: Women playing electric guitar in the shower. Megan proceeds to get ahead of the curve by registering WetRiffs.com.
By doing this, Megan invoked Rule 35 , an additional rule based around rule 34. Rule 35 states: "If there is not porn of it, porn will be made of it."
In the title text, we can assume that the presenter in a spelling bee is asking a male participant with the name "Lance" to spell " throbbing ,"  a term sometimes used to describe the swelling of a person's genitals. The scene thus plays out like the start of a hypothetical homoerotic spelling bee that could contain rude words or innuendo.
Rule 34 is mentioned in the title text of 505: A Bunch of Rocks and 860: Never Do This .
Cueball: Huh-- Thomas the Tank Engine slash fiction. Megan: It's rule 34 of the internet. If you can imagine it, there is porn of it. Cueball: Nah. The web is freaky, but it can't begin to have everything. Cueball: There's no porn set atop storm-chasing vans. No homoerotic spelling bees. No women playing electric guitar in the shower. Megan: Actually, that last one would look pretty hot. As long as they were unplugged or waterproofed... Megan: Rivulets of water run down her chest, the smooth body of the guitar firm against her hips. Megan: She twangs the E-string and it shakes off tiny droplets in all directions. [She rises into a crouch.] Megan: You're sure it doesn't exist? Cueball: Not yet. Megan: I'm registering WetRiffs.com. Let's get on this.
