Knaztip#1:As a spy, Don't disguise as a scout. You'll run slow.Knaztip#2:As a spy, Don't disguise as a heavy. You'll run fast.Knaztip#3:As a spy, Don't disguise as a medic. It's weird how you won't heal people.Knaztip#4:As a spy, when you sap a building, keep moving around and try to sap it when there are alot of people around.Knaztip#5:If all-chat is on, don't tell people how your going to disguise as a medic and sap the sentry behind the CP.Knaztip#6:Worship Knaz, he is your spy-master-that-actually-sucks-at-spy
Also, when you're disguised as a spy and call for medic, it comes up with your name and not the person your cloaked as apparently.