Bartender says, "Sorry, we don't serve frogs here."
Hour later, frog walks in again, "Can I get a drink?"
Bartender, mildy annoyed, "I already told you we don't serve frogs here!"
Frog leaves. Thirty minutes later, frog reappears, "Seriously, can I get a drink?"
Bartender, now enraged, "Look FROG! If you come up and ask one more time I'm going to make an example of you by nailing each one of your four legs to that wall over there!"
Frog leaves.
Half an hour later, frog walks in. "Can I ask a question?"
Bartender, "Sure."
Frog, "Got any nails?"
Bartender, "Nope."
Frog, "Then how about a drink?"

-EJ