Good thing Lisa brought a gas mask with her.
Main series:
- In "Left in the Dark", Lori points out that Lisa is forbidden from using the other kids as experimental guinea pigs. Leni adds in "Especially what you did to me last week!". A flashback shows Leni's head being extremely swollen and covered with pink spots (presumably acne).
- Lincoln spilling out the contents of Lily's diaper genie in "Sleuth or Consequences".
- A similar moment to the one above happens in "Two Boys and a Baby". After Lincoln changes Lily's diaper, he tries to get rid of it with a fishing rod. Unfortunately, the diaper hits a ceiling fan, causing it to spill its contents all over Lisa and Lily's room, and on Lincoln and Clyde.
- In "Undie Pressure", more of Lisa's bathroom studies is shown, and she appears to be examining collected urine and excrement samples from her siblings that are contained in test tubes. Also, Lori going to the bathroom from a bad smoothie.
- In "Toads and Tiaras", Lana and Lincoln finally get to go to Dairyland; Lana ends up vomiting right into Lincoln's mouth while on the Milk Shaker.
- In "It's a Loud, Loud, Loud, Loud House", Charles eats one of Lana's dollars, and she later manages to get it back... only now, it's covered in Charles' poop!
- In "Snow Bored", Lana reveals she has a lucky booger.
- In "Intern for the Worse", Lincoln uses an old lady's car exhaust to heat a burrito for her. She then takes the exhaust-covered burrito without hesitation.
- "Brawl in the Family" features Lincoln eating a bagel that, unbeknownst to him at the time, is covered with lint, dog hair, and boogers.
- In "Room with a Feud", Lily inadvertently sneezes into Lincoln's mouth.
- In a deleted scene from "Lynn-er Takes All", after brushing too excessively, there would have been a shot of Lynn's gums bleeding. This was changed to her losing a tooth because the censors intervened.
- In "Potty Mouth", Lisa is disguised as Lily to take her place in an interview after hearing her baby sister curse aloud. When told to act more like Lily, she intentionally goes in her own diaper.
- "One Flu Over the Loud House":
- The sisters sneezing and coughing on each other and drinking from the carton.
- Lori sneezing on Lynn's ball, then Lynn spinning it and getting Lori's snot sprayed in her face.
- Lincoln scaring Lori out of the bathroom with Lily's dirty diaper in "Bathroom Break".
- Quite a few gross things happen in "Tripped!":
- Lori farting in Vanzilla. It doesn't help that it was so deadly that the other Louds were practically suffocating from it before the windows were opened, including Lynn Sr.'s quip that the fumes got in his mouth. It's no wonder Lori is constantly mocked for it for the rest of the episode.
- Leni's expired egg salad sandwiches. No one even knew they were expired until after they all chowed down on them, leading to a family-wide trip to the gas station to puke.
- Lola finds the cherries the farmer gives to the Louds delicious, that is until said farmer mentions that it was about using the right kind of manure (presumably for fertilizer) to treat them. Lana, of course, still finds the cherries pretty tasty, and can even identify "horse notes" in their flavor, implying that she has literally eaten poop, before...
- In "Room and Hoard", Lisa is studying her infant fecal samples, and it is revealed that she has saved every dirty diaper since her infanthood.
- A good amount of Flip's biological oddities in "Blinded By Science" are this but special mention goes to the Gross-Up Close-Up of his four butts.
The Casagrandes:
- In "Croaked", Ronnie Anne, Sid, Adelaide, and Sergio use Carlitos' dirty diaper to attract flies for Froggy to catch.
- In "Never Friending Story", when we learn that Mr. Nakamura's dog Nelson gets "the poops" upon eating almonds, extremely gross squirting sounds can be heard offscreen.
- The "Dizzy Carl" sequence in "Maybe-Sitter" ends with Carl throwing up all over Bobby's cat pajamas. ONSCREEN no less. Lampshaded by Bobby, who looks like he's about to puke as well.
- "Gossipy Girl" has Nikki taking a bite out of a corn dog that was previously stuck up her nose.
