A Very Sunny Christmas [S06E13]
Charlie: Dude, this was like the best tradition ever. Every Christmas morning, I would run to the door and I’d open it and I’d find the first Santa Claus. Now, the Santa Claus would come in and give me a present or something, and then he’d go in the room with my mom and cheer her up for a while. And then the doorbell would ring and the next Santa would come and give me a present or something or other, and he’d cheer my mom up for a while. I didn’t always understand the presents, but I always found a way to have fun with them.
Mac: Charlie, I hate to break this to you, but based on the story you just told me, I think your mother was a prostitute.