As usual, Sheldon was repetitively, yet impatiently knocking at Penny's door until she finally answered with an irritated "What?". Sheldon answered:
"Can I, or may I come in?"
Penny: "I don't know, may you?"
So, Sheldon walks in, sits at her couch, and negotiates (vinyl) record shopping with her and his friends, being that a new record and cassette secondhand store opened across the street from their apartment building. She agrees, and so does everyone else. Even the ones who aren't into what the store is selling, come anyway.
Meanwhile, at the record/tape store, ignoring Sheldon's lust for his childhood being re-lived, Bernadette picked up what seemed to be an LP of the first Back To The Future movie. She wasn't sure how there could possibly be a record of the BTTF movie. A soundtrack?, she thought. Maybe. In fact, it was oddly specific. All that was on the back cover was the normal movie blurb, fine-print credits, rating, etc. No track list whatsoever. She called over Amy and Penny. As Bernadette peeked in, this was no ordinary "record" like she's seen before. There were no grooves, just a slick, glossy surface. Heck, this wasn't even the color black! It was SILVER and shiny! She immediately went over to Sheldon, whom already was holding 4 '80's mixtapes in one hand, cash payment in the other.
"Uh, Sheldon, you might want to look at this, being you're, more into technology than me and the women." (calling him a nerd was noted as an insult, ever since they met).
"OK. Give me it."
It was at this moment, Sheldon sent the store and him back 30 years, figuratively.
Berna got jumpscared from the clattering of the 4 tapes he dropped dramatically in response to what was seen before his eyes. He was just shocked enough to pull the disc from the protective jacket. Out came the most beautiful, exhilerating video disc in format history. Ironically, in relevance to the movie on the disc, he responded wide-eyed and dramatic:
"Great Scott."
AN: In case if you don't know what happened here, Sheldon found a Laserdisc in a record/tape store. It was mistaken for a record due to its size (12 in/30 cm). There is a picture of one on the cover.