A young man comes to a bar.  He doesn't have much luck, and strikes out time and time again.  It's 1:00 AM, and he's getting ready to call it a night.  Suddenly, a 50-something woman starts hitting on him hardcore.  He's not too excited about her, but she looks good for her age and feels like a breath of fresh air after endless rejections, so he flirts back.  Half hour later, she asks him: "Have you ever had a mother/daughter threesome?"  He says no.  "Would you like to try one?"  "Yeah!"  "Then let's go back to my place!"

They get into a taxi, and get dropped off at the woman's house.  She walks in, and leads him inside holding his hand.  As soon as they get in, she shouts: "Mom, are you home? I brought a new friend!"