Every single conversation I've ever had while working with someone (anyone) and looking at an Excel spreadsheet:
One of us: Wait, what did you just do?
The other of us: I hit this key and that key.
One of us: That works?
The other of us, pointing at screen: Yeah.
One of us: I've never seen that before. I do the same thing but by hitting this key and that key.
The other of us: Really?
One of us: Yeah.
Both of us: *confused stare*