Howard: Could never bring myself to open it without him. It's silly.
Sheldon: No, it's not silly. I always wanted my dad to build rockets with me, but he wasn't interested.
Raj: Ah, yes, disappointing fathers. Tell me about it. I remember for my 16th birthday, my dad bought me a Mercedes. Like, a little one, like a starter Mercedes. He had barely handed me the keys before he had to rush back to work. I didn't see him again till, like, pretty late that night.