In fact, one of the NBA’s annual player awards is the Sixth Man of the Year Award.
Out of 173 episodes:
Ruthie Cohen: 101 episodes.
Newman: 45.
Not even close. 
Larry David has 38 voice/acting appearances on the show, co-creator, frequent writer and was the basis for George. Some of his real life experiences were worked into the show. He’s the best candidate for 5th cast member.
This one is super local so it will require some explaining. I used to work for Intel, the big semiconductor company. The numbering system they use to identify their buildings uses a two letter code to identify the campus (for example, SC for Santa Clara, CA, FM for Folsom, CA), and a number for each individual building on that campus. The campus in Folsom, where I worked, had seven buildings, designated FM1 through FM7. Any bar or restaurant in Folsom that becomes a popular after work hangout for Intel employees (the town’s largest employer) gets nicknamed FM8, at least among said employees.
Did the poster mention that it collapsed in 1879 after 19 months of official service? There hadn’t been any reinforcing for wind.
It was the longest bridge in the world when it was first completed, which would qualify it as a wonder. All 75 people on the train that was crossing it at the time of collapse were killed. The collapse was commemorated by what some people think is one of the worst poems ever written.
I have heard “Love thy neighbor as you would yourself” referred to as the Eleventh Commandment
The poster didn’t, because its creators couldn’t see into the future, and if they could it would have put a bit of a dampener on the bridge’s opening ceremony!
But the museum was in Dundee, and the poster was part of a display about the disaster, alongside bits of the actual bridge and train.
Much more often you will hear “Thou shalt not get caught” as the 11th commandment.
Phish fans often refer to their lighting designer Chris Kuroda as “CK5” because he is essentially a fifth member of the band.
:smack: Sorry, I somehow slid over the opening ceremony part.
Most of Ms Cohen’s appearances were as an extra, the cashier in the coffee shop. I am not sure that counts.
As for Larry David, he might have a claim to be the 5th cast member, but I stand by Newman as the fifth character.
Brahms’s Symphony No. 1 is sometimes called “Beethoven’s Tenth”.
In the Reagan era, it became “thou shalt not speak ill of a fellow Republican”, in other words, ‘knock off the infighting and focus on the other side’.
Yeah well, that’s just like your opinion, man.
Stewart was definitely the fifth Big Bang male cast member.
Of course, the accomplice of Burgess and Maclean, who turned out to be Philby, was nicknamed ‘The Third Man’ after the film. It then didn’t take much imagination for the next two to be called ‘The Fourth Man’ and ‘The Fifth Man’.
They way I heard the 11th Commandment was, “Thou shalt not schtup a shiksa.”
That expression had its origin in the Spanish Civil War, it predates WWII by a few years (the expression was first used in 1936). The expression spread pretty quickly considering it was pre-internet days. General Mola must have hit a powerful nerve.
The Beatles also sang about “eight days a week.”
It’s definitely a thing: 51st state - Wikipedia
My favorite: a reunited, pro-US Vietnam in Watchmen.
There are some who call Donald Trump “the 45th President”
Nobody’s mentioned Sixth Sense yet. Didn’t see that one coming did ya!
In this film
some ordinary Brazilians refer to the “third half” of their weekly casual game–meaning the post-match beer drinking.