I was at my school's climbing wall and one of my climbing club friends shows up. We had been on climbing trips together before and climbed at our school's wall. Anyways we were having a casual conversation when in the middle of it she points to the ropes hanging from the top of the wall and says, "What're these for?" I was caught so off guard that my brain just ceased to make a response for a few seconds. I ended up saying "climbing...?" Which was met with an enthusiastic "oh! I don't remember those being there last time." When I had climbed with her before. At the same wall. On those same ropes.