Quotes: Let Us Never Speak of This Again

Homer: North, South. Ah nuts to this. I'm going to take a short cut.
Marge: Homer, no, you're going to get lost.
Homer: Trust me Marge, with today's modern cars you can't get lost. What with all the silicon chips and such.
(later)
Homer: Alright, we're here! Let us never speak of the shortcut again.
The Simpsons, "Itchy & Scratchyland"

"The two boys stood at the front gate for three minutes before facing each other. There was an unsaid vow that stated that neither of them would ever mention this incident ever again."

"...I'll say this... The principal offenders were Junpei and Ryoji. We were forced to commit the crime, against our will. We were victims too. ...... ...Now please, do not mention it ever again. "
Akihiko Sanada, Persona 3, after getting executed

Rarity: (after having her being brainwashed into loving a giant boulder reversed) let us never speak of this again.
Later
Rarity: (When her falling in love with a boulder is mentioned again) I thought we agreed never to speak of that again.
My Little Pony: Friendship Is Magic, "The Return of Harmony, Part 2"

'"Not another word about this...EVER!!!"
Squidward Tentacles, Spongebob Squarepants, "Squid Baby"

"If anybody ever asks, there were fifty of them. And they were...rattlesnakes."
Diego, Ice Age: The Meltdown

Skipper: We take this shame to our graves.
Kowalski: Agreed.