Friday night, the phone rings just as a plumber out with his girlfriend at the restaurant.
- Good evening Mr. plumber, here Dr. Dupont, your doctor.
- Hello doctor, what can I do for you?
- Listen, my toilet is blocked, I can not repair them. Come to me now!
- But doctor, it's Friday night, I booked a table at the restaurant, I go with my fiancee.
- Listen! When you are sick and you call me, you do not ask if I'm out with my wife to the theater.
I come when you need me!
- Of course doctor, I'll be home in 10 minutes.
10 minutes pass and the plumber comes in black suit three parts.
It goes directly to the toilet, throw two white tablets in the toilet and watching the frothing said:
- Well, I put two bullets, I will still leaves 6, put in an every 6 hours ..
Observe your toilet during the weekend, and if it does not improve, you call me Monday.