Sheldon introduces to Penny the notion of the assembly line.
Read MoreDry Cleaners Shouldn't Make Keys
Sheldon doesn't trust Penny's dry cleaner because he also makes keys.
Read MoreTeaching Economics with CBS's The Big Bang Theory
Sheldon introduces to Penny the notion of the assembly line.
Read MoreSheldon doesn't trust Penny's dry cleaner because he also makes keys.
Read More