I still remember vividly one Pax question to me after we landed in IAH. We had just pulled up to the gate and #1 was shut down. As the Pax were deplaning, we had one guy come up to me (I was standing in the galley with the FA) and say "you might want to have that left engine checked out". I replied with "why would you say that sir?" ... his response almost made me laugh uncontrollably. "Well sir, as we were coming in on short final I noticed some gyroscopic precision on that prop out there". I could just hear the captain laughing hysterically up front, and all I could get out of my mouth without laughing was "ok, sir, we'll check on that".