Child support gone mad...

Why on earth are they forcing this guy to pay child support???

A sperm donor who sent gifts signed "Dad" to his biological son has been slapped with a child-support order, 18 years after helping his friend get pregnant.

The Nassau County man donated his sperm to a work colleague, and included his name on the child's birth certificate, saying it would give the boy an identity, courts documents revealed.

He then blurred the lines between donor and full-time father by sending money, presents and cards signed "Dad" and "Daddy," and having phone chats with the now college-bound teen.

But the man's goodwill backfired: A court ruling says he is now liable for financial support of the 18-year-old, who lives with his mother in Oregon.

"It really is no good deed goes unpunished," said the man's lawyer, Deborah Kelly of Potrush and Daab in Garden City.