Ran into my first official scammer.
We agreed to trade unusuals. We put up both our hats and just as we are ready to trade, he cancels it. He says "steam froze". We decide to try again. This time he puts up a non-unusual version of his hat and thinks I wouldn't notice. I point out it's the wrong hat and he puts up the right one. As we are both ready to trade, he cancels again and says "steam froze". He then says "I'll pass" and disconnects and changes his name.
I change name and avatar. I add him and he wants to trade unusuals. He says "HURRY I HAVE TO LEAVE" and such. We put up unsuals and repeats the same scene this time saying things such as "HURRY" to make me rush. I keep it going one more time before he catches on and quickly disconnects and changes his name again. That time I managed to get his profile info and added a comment since I can only do that when the person is a "friend". Worth it.
Didn't manage to get screenshots unfortunately, but I did find the profile. You guys report him or something for me.
Edit: Some guy just added me and told me the same happened to him. Told him what to do since he was new.