While my Mandarin has been improving, I still find I have a lot of difficulty communicating with elderly people. In the end I thought understood, but I ran around the corner so they wouldn't try speak to me (which doesn't work because I haven't a clue what they're saying). I could hear them chatting away, so I thought all was well. I thank them, take notes* and don't think anything of it. Later I check out the video and I'm pretty sure they're just chatting about the strange foreigner staying out back.
* Notes: So as usual, I mark the time and date, names and rough contents of the material being recorded. I found this quicker to do on paper. Some days later the second major typhoon hits Taiwan. The window is open in my room, all of my notes and lots of other documents were thoroughly drenched for an entire day and ended up becoming one large paper pulp. This was a disaster that I spent the rest of my trip attempting to recover from.