I don't know if I would call this the 'best' thing, but this one certainly sticks in my mind as someone going above and beyond to help out another human being... A few months back ex T (ex for over 15 years) gave us an emergency Skype session when we were in crisis and no other support was available. She was on vacation in another continent at the time, and got up at 6am so she could talk to us in privacy. She wouldn't let us pay for it, either.

Same question for next person... what is the best thing a T has ever done for you?