If You have one sentence to test if a stranger has played/seen FFVII

[Lestat]

Valar jenovus

 

[LegendarySaiyan]

"This guy are sick."

 

[Cat on Mars]

"Attack when the Scorpion's tail is up."
Misleading translations are the way to go.

 

[Rydeen]

“Off course!”

 

[Nandemoyasan]

I would say to them "Say, aren't you bored?"

If they then reply "Yeah, we fight a lot," then I know.

 

[Erotic Materia]

"Are you... THE beautiful bro?"