Paul McCartney almost played Ross' father-in-Law on 'Friends'

Beatle star Paul McCartney almost guest starred on "Friends" as he was offered the role of Ross' father-in-law.
Emmy-nominated casting director Leslie Litt, who was working on the NBC hit series during most of its run, revealed that McCartney, now 72, could've appeared in the season 4 finale of the show as David Schwimmer's on-screen father-in-law, but he turned it down, reported Huffington Post.
"I went through his manager and gave him all the details. One day, someone in the office brought me a faxed letter written to me by Paul himself! He thanked me for my interest and said how flattered he was, but it was a very busy time for him," Litt said.

If the British musician had agreed to do it, he would've appeared in the two-part season four finale which aired in 1998.
In the said outing, Ross married Emily (Helen Baxendale) in London though he accidentally said Rachel's (Jennifer Aniston) name instead of his bride's name at the altar.