And the single right answer is...?

I'm 39: The name of Tom Mix horse.
? The name of the RCA Dog who is waiting for his Master's Voice.
? 42
-The ultimate answer to life, the universe and everything (according to Douglas Adam's Hitchhiker's guide to the Galaxy series) What a Church Key is.
? That ALL beer is brewed cold.
? Big Momma Thornton.
? Who's on first?
-Abbot & Costello comedy routine That "Frankie & Johnny were lovers" is not about a same sex marriage.
-I know that this is a reference to some old thing, but before reading Phat's reply that it's a Country Song... I'm not sure if I would have connected that specifically or not. That it's always 5 o'clock somewhere.
-to me, this is a comedic reference to it being okay to drink in the morning (or anytime)
-my guess is that it's from an old song or movie pop-culture thing That you can tune a piano but you can't tuna fish.
-I'd never be able to say who, but my guess would be that this is some comedy line from an older comedian like Johnny Carson or something like that. Why there was a baby face on the bottle.
? Mississippi John Hurt.
? When the Cuyahoga River caught fire.
? A B-9 Class M-3 General Utility Non-Theorizing Environmental Control Robot said ...?
?
(Although, if Phat's right... I do know what Lost in Space is and what Danger Will Robinson refers to) Fulda Gap.
? Hof Corridor.
? Formosan Strait.
? Quemoy & Matsu.
? Bikini Atoll.
?
Bikini Bottom is where Sponge Bob Square Pants lives Widdershins.
?

I'm old enough to know who Tom Mix was in the same way as you're old enough to know who John Wayne was. Google "paint can opener". That's a bottle opener on the other end. Looks like an old-fashioned key, doesn't it? I have one of those that I got from my dad. "HE was HER man and HE done HER wrong." In Canada we just call it "tuna". We assume it isn't "tuna horse".

Sadly, Tom Mix got killed by his suitcase.