Well, there go your holiday memories.

Jimmy Fallon’s “Thank You Notes” just revealed the truth behind some of your favorite holiday traditions, and it will totally open your eyes. For instance, have you ever noticed how stockings are basically flammable pieces of fabric hung above a fire? Or have you thought about the real reason why Rudolph the Red-Nosed Reindeer was so popular?

After this, all you can really say is, “Thank you, Jimmy Fallon, for completely destroying the holidays in the best way ever.”

“The Tonight Show Starring Jimmy Fallon” airs weeknights at 11:35 p.m. ET on NBC.