Thought of an introduction made in heaven already!
There's a woman (I'll call A) who catalogues & shelves books where I do voluntary work.
An extremely nice woman, but ....
If, in passing, you ask something like : "How's the shelving going?"
You will be stuck for 20 minutes, eyes glazing over, while she explains (in depth!) the pros, cons, difficulties, etc, etc, of shelving books! And will continue from where she left off the next time your paths cross!
I'd like to introduce A to Bill.
They could have extended, deeply fascinating topic discussions on all their favourite subjects ... a thread that never has to end! With always some new point to be made to keep the ball rolling!