This happened to the sister of someone I went out with.
So the guy and girl are out on a date and quickly run out of things to talk about. They get up to walk around and he asks her if she was ever here before. She remembers being brought there a year before by a guy but couldn’t remember any details. He said he once brought a girl there but couldn’t remember who.
Eventually they realized that they had gone out with each other the previous year and to the same exact place. They spent the rest of the date trying to remember who said no. (They couldn’t figure it out until she got home and checked her notes, buy at least they had something to talk about.)
Sadly it didn’t work out. Maybe the third time around it will.