Dentist: Did you follow the advice I gave you in our last sitting ?
Me: Sure did!
Dentist: Great, let's see!
*Inspects teeth*
Dentist: Your teeth look horrible.
Me: I did exactly what you advised me to do!
Dentist: You brushed your teeth twice a day every day?
Me: Twice???
Dentist: Yes, I told you to brush before bed and in the morning!
Me: That's exactly what I did! Sometimes it was hard to fulfill both conditions at the same time, so I had to brush twice, but I managed to do it on the other days!
Dentist: Fucking programmers.