Why do I think this is so funny...?
A local United Way office realized that the organization had never received a donation from the town's most successful lawyer. The person in charge of contributions called him to persuade him to contribute. 
"Our research shows that out of a yearly income of at least $500,000, you give not a penny to charity. Wouldn't you like to give back to the community in some way?" 
The lawyer mulled this over for a moment and replied, "First, did your research also show that my mother is dying after a long illness, and has medical bills that are several times her annual income?" 
Embarrassed, the United Way rep mumbled, "Um ... no." 
The lawyer interrupts, "or that my brother, a disabled veteran, is blind and confined to a wheelchair?" 
The stricken United Way rep began to stammer out an apology, but was interrupted again. 
"or that my sister's husband died in a traffic accident," the lawyer's voice rising in indignation, "leaving her penniless with three children?!" 
The humiliated United Way rep, completely beaten, said simply, "I had no idea..." 
On a roll, the lawyer cut him off once again, "So if I don't give any money to them, why should I give any to you?"