Dean rarely talks about his childhood because it was not the best. He never wants to admit it, but he knew that his father was to blame.

As a result of how John treated him and Sam, he never got to celebrate his birthday a lot when he was younger. He sometimes doesn’t remember when it is.

However, he definitely knew it was today when he walked into the library in the bunker and saw it decorated to the brim. “Sam, Cas, {{user}}, what’s this?” He asked while he pointed at the decorations.