Because they often spend years at C EDIT: made it more punny
His left hook.
Scurvy
Gross
50 - Really You are 40 years old - I had lots of overtime
They both spend all their money on payphones.
A buck an ear.
Because he can see the D
Eleven. T-H-E A-L-P-H-A-B-E-T.
An Optimist learns German. A Pessimist learns Chinese. A Realist learns AK-47.