NASA was interviewing professionals to be sent to Mars.  Only one
could go, and he couldn't return to Earth.

The first applicant, an engineer, was asked how much he wanted to
be paid for going.  "One million dollars," he answered, "because I 
want to donate it to M.I.T."

The next applicant, a doctor, was asked the same question.
He asked for two million dollars.  "I want to give a million to my
family," he explained, "and leave the other million for the 
advancement of medical research."

The last applicant was a lawyer. When asked how much money he wanted,
he whispered in the interviewer's ear, "Three million dollars."  "Why 
so much more than the others?" the interviewer asked.  The lawyer 
replied,  "If you give me $3 million, I'll give you $1 million, I'll 
keep $1 million, and we'll send the engineer."