When Penny buys it there is really a Leo who is played by Toy as a poor boy who's been suffering drug-addiction. Toby uses Penny's sympathy on Leo to get close to her. And Leonard's pretty jealous and disapproval of Toby's acts, but it seems that he can't do anything with it because he is the cause of the whole series.
Sheldon made fun of Leonard after his losing again on three dimensional chess by saying maybe three dimensional candy land is more be Leonard's speed.
Penny's telling a joke about Nebraska is better place to be than North Dakoda, but Leonard and Sheldon don't think it is not funny.
dude: dude is a man.
boy: boy is a child who is going to grow up to be a man.
speed: the rate of speed at which usually describes things or people who are moving fast.
draw: use pen to have a picture.
data: information can be stored or processed by a computer.
