Son: After I graduate college I want become a sales person because there must be hundreds of different types, which gives me options.

Dad: There may be many different types of products but there are only three types of sales people...

The first type will take your commissions and doesn't care if you know...

The second type will take your commissions if they don't think you'll figure it out...

The third type are people that don't know what they're doing. In the end they'll take your commissions accidentally.

Son: That must mean there's a fourth type, someone who is actually a #1 but pretends to be a #3 so you won't get mad at them.

Dad: Actually son, now you're getting into sales management.