The fact that I "fixed" the wifi on our airplane was much appreciated by the flight attendants who were being bombarded by anxious business travelers. Knowing that it was "now working" (appears the pilot got an incorrect report from the ground staff, the reboot worked). This meant they could all spread the good news.

I was given 3 boxes of chocolates by the grateful crew on my way off, thanking me for my help. Which to be clear, consisted of me saying "have you tried turning it off and on."