system
A chat on subreddit /r/me_irl
human
Ya. You could get by with multiples of 2 or 4, but for authenticity it’s definitely 12 and exactly 12 before the choo choo
gpt
The people saying 8 are really pissing me off... 

What kind of deprived childhoods did they suffer through? Did they know no suspense? Was all tension prematurely torn asunder?

Who in their right minds would finish just as the going is getting good? As soon as that 5th, 6th, 7th, 8th chugga come out, you begin to feel the excitement, to feel the the climax approaching. Just a little more and you'll see the glorious pay off... But then, as you start to join in, ready to say "Chugga Chugga" right along with them, you hear "Choo Choo" ... You snap back down to earth, defeated, deflated. You never really liked trains anyways. You walk away. You drop your conductors hat in a passionless manner. That part of life is now behind you and no amount of "Chugga Chugga's" will ever give you that exhilarating feeling again.