Private Smith and Pvt. Jones just got promoted from Private (Pvt.) to Sergeant (Sgt.) They were walking down the street and Smith sees an NCO club. He said, "Let's go in here."
Jones said, "We can't, we're only PVT's."
Smith said, "No, we're Sgt's now."
Jones said, "Oh yeah!"
They went in and a Prostitute came to Smith and said, "Lets do it! But I must warn you, I have the Clap."
He said, "Hay, go look up the Clap and if it is OK, give me the thumbs up. If not give me thumbs down."
Jones found a dictionary and looked it up and came back and gave Smith thumbs up.
Smith had sex with this girl and a month later he was in the hospital really sick.
Jones came to visit him one day and he asked, "If you knew it was going to be this bad, why did you give me the thumbs up?"
Jones said, "In the dictionary it says, the clap only affects the privates."
He held up his new rank and said, "We're Sgt's. now!