One night

One night, while on foot patrol, a Police officer approached a local bar. Through the door stumbled a drunk who promptly fell on his backside.

He lay on the ground with his eyes closed. Upon opening his eyes, he sees the Officer looking down at him.

He says,"Osifer, did you see me fall!"

The Officer says,"Yeah, I did."

The drunk asks, “Do you know who I am?"

"Nope." Comes the reply.

"Well,” says the drunk, “Then how do you know it was me that fell?"