Disguising as a heavy can be good if the enemy has a lot of medics.Dr. wonderful said:Spies hardly give me trouble cause I seen some dumb motherfuckers play as Spies.
1) They play as scout, which they know that it stupid cause they cannot re-create the speed. Same as heavy.
2) When they cloak, they make sure to do it in the open.
3) They backstab in a crowded room. Enuff said.
I've gotten medics to blow ubers as a spy making them think I was going to take a sentry down or push forward.
I've also gotten medics a domination on someone on their own team via their assist on me killing them while healing me.
Disguising as a scout is good if you are ahead of where the rest of the other team would be, and coming back towards them calling medic at the beginning of a game isn't entirely out of the norm.
Disguising as a medic or soldier/demo is good for approaching a bomb cart full of people.
If you want to linger in an area for while, sniper is obvious.
Just don't disguise as a pyro, because a pyro who isn't occasionally spitting out a burst of flame is a dead giveaway.
Also, if you use quickswitch and use last disguise while running towards people so it looks like you're just bored and switching weapons can sometimes help add authenticity to your disguise.
Also, if someone shoots at you, don't run the moment they do. Just stand and look at them, you will take damage, but you usually wont get shot more than once or twice which is survivable, and after that people in that area usually won't give you a second glance.
But that being said, stay out of line of sight as much as possible.