My first ever flying lesson. My and my instructor were ferried to a distant airfield to pick up a plane which had been painted. The flight back would be my first lesson. After doing their (shoddy) paint job, the painters had removed all masking tape. Except for the pitot/static mast (PA-28).
Oh, and this was a short grass strip and the temperature was already above 30C when we discovered this. It would not have been pretty.