"I'll have a pepsi."
"We have coke, is that good enough?"
"Okay."
"I'll have a coke."
"We have pepsi, is that good enough?"
"Okay."
"I'll have a mountain dew."
"We don't have any."
"FUUU-"
Whenever you ask for coke, they have pepsi. Whenever you ask for pepsi, they have coke. Whenever you ask for mountain dew, they don't have any.