In S01E03 the one with the thumb, Phoebe gets $7,000 after she saw a thumb in her soda can. She is obviously skeptical about the money and does not want to spend it, like she gave $1,000 to the homeless woman earlier.
Later she tells Chandler she will give the money to him if he quits smoking. Did she actually give it to him?
There was never a mention of this money again, if she spent it, or saved it, or gave it to charity or to Chandler. Considering $7,000 was a big amount at that time, what did she actually do with the money?