This is en episode from season 8: "The one where Joey dates Rachel"
Phoebe has bought a PacMan machine as a wedding gift for Monica and Chandler. Chandler has been playing it all day and has put all kinds of three lettered dirty words in the top score list. This becomes a problem when little Ben will come and visit them to play at the machine. Phoebe tries to beat all the top scores chandler made, so she can eliminate the dirty words Chandler put in. But when she allmost beats the last topscore, something goes substantially wrong.
I love this part. Almost made me ROFL!
![](https://i.ytimg.com/vi/PLLi52O2CTA/mqdefault.jpg)