When Leonard isn't able to fly out to his old high school to give a graduation speech, Penny helps him give the speech via Skype instead. Unfortunately, she was only able to get him a cap and gown from a costume store, but Leonard wears it well in this funny clip.
Sheldon: Aren't you afraid of being blinded?
Leonard: How would I be blinded?
Sheldon: At the end of the ceremony, all the students throw those pointy hats in the air. It's all pomp and circumstance until someone loses an eye.
Penny: Think we'll have time to visit your mom while we're there?
Leonard: Yes. We'll also have time to put my junk in a garlic press, but I'm not doing that either.