Somebody tell me a joke!

In the supermarket, an old man is looking at the packaging of milk powder. At this time, a thief put his hand into the old man's bulging coat pocket. A customer nearby found it, and so did the clerk. No one dared to shout because the thief was fierce. Seeing that the thief's fingers were already stretched tightly in his pocket, the old man didn't notice. The salesgirl used her quick wits and shouted to the old man, "Hey, old man, come and pay quickly, don't put it in front of others."

The old man got angry when he heard it. "What is your attitude? Can't I look carefully? " As he spoke, the old man raised his left hand, as if afraid of obstructing the thief. Seeing female customers around, the thief is even more unscrupulous. Finally, the thief stole the paper bag.

The thief walked out of the supermarket, and the customers and salespeople blamed the old man. Unexpectedly, the old man said, "Thank you, I know someone moved my bag."

"What?" People looked at the old man puzzled.

"That's phlegm wrapped in paper. I can't find a place to throw it. Let the thief help. "