When you change colour change your name too. Then you can give them false info like saying that an engineer is a spy while you are a demoman. Cause most peopple will just look at the colour on the scores list and not notice that it say red next to the blue colour. Submitted by Iax.

If you are getting chased in a place where deep shadows are accessible (the roof on 2fort4 for example), run for the dark like a cockroach. As soon as you get in the shadows, hit the dirt. A lot of the time the enemy will be so intent on chasing you they wont see you feigning in the dark and will run right past. Also, feigning in the dark around sniper nests can give you a spot to hide without having to run all around and risk being caught (try right against the slit in the wall in 2fort4 or well6.. if you lie parallel to the wall, you're pretty much undetectable).
Submitted by [SH] Black Ice

If you're feigning and some damn camper is standing right on you, id him and say something like "hey Bob da Man, go to the respawn room". Usually the un-perceptive person will just stumble happily into whatever wild goose chase you give him to see what is there, never even considering the possibility that he was standing on you.
Submitted by [SH] Black Ice

Make sure no-one BLURTS OUT YOUR PROFESSION while you are disguised.I had this happen to me once.Ruined my luck.
Submitted by Rattrap

Yell that someone else is a spy and lob a regular grenade at them. Every one expects you to lob a gas grenade. Confuses the hell out of em. he he. "Wait, no, no, I'm on your team." "Ya right"
Submitted by ?

The best use I have seen of the feign is two or more spies meeting up right outside the flag room, feigning until the time is right, and then springing into action. Very effective and usually unexpected.
Submitted by Sentinel

Everyone knows that hallucinogen cloud is not a fatal thing, (everyone can run thru it), thats why you might have to "boost" your cloud with 1-3 hallucinogen grenades, and give 'em a fatal surprise.
Submitted by Focus[C]

You're running to the upper supply from the elevator and see a demo laying a det in your ramp room. Take out your tranq gun, and start shooting tranq darts at him. If you get 3 or more hit before he lays the det, you get to see something funny! Those tranqs will slow him down like hell, and odds are he's just laid a 5 second det. He tries to run, but he's moving like a turtle and can't escape the blast of the det in time!
Submitted by Canuck[FC]

There is a soldier or sniper floating in the water wreacking havoc on your snipers. Disguise then jump in with him, take out your tranq dart and shoot at least 5 tranq darts in him (if you can) Then start nailing him. He'll proably swim down to avoid the nails, but is swimming extremely slow! so take down his health a fair bit and watch him drown.
Submitted by Canuck[FC]

The first thing a see a newbie spy doing is running around disquised with thier knife out. Its a dead give away unless you are a medic or engineer. Put that knife away till your ready to use it!
Submitted by Raphael >{UT}

What would you do if you heard a nailgun near you? Probably go find out what enemy was shooting, right? Take care of this problem by knifing whenever possible. It saves ammo for you inside their base and is much quieter. All you hear is a scream and no nailgun or shotgun noise. This could mean that the guy died from disease, suicide, or gas... wait a minute... DOH!. Submitted by =SD= Taniwha

When you are in the enemy base, disguised, of course, you may want to change your skin. I find that the easiest way to do this is to feign death. Then change your skin. That way people see less of your skin changing, and more of a dead person. Of course, don't feign in the "middle of the road" Submitted by Casebier[ST]

Whenever possible, gain up yer armor and grenade jump into the enemy sniper nest, kill all enemy snipers, then run into thier upper respawn and feign, change skin, and then wait for an enemy to respawn. Find out an enemy's class by looking at enemy corpses, then change skin to that. This is the way not to get caught. The key to the spy is changing skins, but you probably already knew that...:)
Submitted by [MH]#1Assassin]LqD[