The customer says, "Sure, just give me chocolate, please."
The clerk again apologizes, and thinking that the woman didn't hear him, says, "I'm sorry, we don't have any chocolate left. Is there another flavor that I can get for you?"
The woman says, "Well I guess I'll have chocolate."
The clerk, extremely pissed now, tells the woman, "Spell VAN as in vanilla."
The woman spells out, "V-A-N."
"Now," says the clerk, "spell STRAW as in strawberry."
The woman spells out, "S-T-R-A-W."
"Okay," says the clerk, "Now spell FUCK as in Chocolate."
The woman looks dumbfounded for a moment and proclaims, "Wait - there's no 'FUCK' in 'chocolate!'"
And the Clerk replies, "That's what I've been trying to tell you!"