"Bank Robber" joke

A
man wearing a mask bursts into a sperm bank with a shot
gun. "Open the safe!" he yells at the girl
behind the counter.
"But we're not a real bank" replies the
girl. "This is a sperm bank, we don't hold money".
"Don't argue just open the safe or I'll blow
your head off!" She obliges and opens the safe
door.
"Take one of the bottles and drink it!"
"But it's full of sperm" the girl replies
nervously.
"Don't argue, just drink it" he says.
She prys off the cap and gulps it down.
"Take out another one and drink it too!"
he demands.
The girl drinks another one.
Suddenly the guy pulls off the mask and to the girl's
amazement it's her husband...
"Not that damn difficult, is it?" he says.