Sheldon: We were in the bookstore, and I found this. "Experimenting with Babies: 50 Amazing Science Projects You Can Perform on Your Kid".
Raj: You can't experiment on his kids.
Sheldon: Yeah, you're not their father.
Howard: You can't experiment on my kids.
Sheldon: [sighs] Fine. Can I at least play a game with them? Perhaps "How Developed is Your Peripheral Vision"? [Leonard rolls his eyes] Mine's great. I saw that.