More like a plot idea: similar to Lynn's. Two characters are trapped in a place where they develop a deep connection for what feel like a soul wrenching amount of time and when they manage to escape no time has passed at all.

Only downside is: only one of them actually remembers the experience. The other is left none the wiser. The remembering character now has a problem: they know the other person so very intimately - will they try and get the person to remember? Convince themselves that it was really just them in the experience all along? Accept that the other person doesn't remember them and either leave them to have their own life but be left with the aching question about what could've been or will they try to establish a new relationship with them where they know everything about the other person without being told and if that's the case... How quickly would it take the other to be creeped out and suspicious of the fact that the person with the memories is a stalker...

Also. Names I come across that are awesome: Quartermaine.