From Google:
"A vasectomy reversal is a delicate microsurgical procedure that reconnects the tubes (vas deferens) that were cut during a vasectomy to allow sperm to enter the ejaculate again. It is performed on an outpatient basis under general anesthesia.
Success depends heavily on the skill of the microsurgeon and how long it has been since the original vasectomy, although reversals can be successfully performed decades later."

Reverse vasectomy?? That's actually possible??