**Joke**

Heard from my English teacher, Gerrut.
Logic, Fishtank=Aquarium
Barman (Britich English)=Bartender (American English)
Mr.A came into a bar and had a talk with Barman as following:
Bartender: It's a long time not to see you. What are you doing recently?
Mr.A: I am attending to a night-school.
Bartendar: What are you studing?
Mr.A: Logic.
Bartender: What's Logic?
Mr.A: Let me take an example. Do you have a fishtank?
Bartender: Yes.
Mr.A: Then, you must have fish in your fishtank.
Bartender: Yes.
Mr.A: Then, you must like animals.
Bartender: Yes.
Mr.A: Then, you must like children.
Bartender: Yes.
Mr.A: Then, you must like women.
Bartender: Yes! Yes!
Mr.A: So that's Logic.
After Mr.A left, Mr.B came in. He just wanted to have a drink and no talking. But the Bartender wanted to talk with him to show he knows something.
Bartender asked: Do you have a fishtank?
Mr.B: No!
Bartender: Oh! Then, you must be a gay!