Drafting

I get behind another wheel... its just a reflex to draft and I gage their experience by their reaction... if its "Oi get off! Do your own work! I've got a long way to go!". then we know they are complete idiots/jerks. If its a quick glance behind and no reaction then we know they have experience and could care less what you are doing.

Lies.

I don't want to have to concern myself with some idiot on my ass, how do I know his skill level if I have never ridden with him before?

Best tactic for ridding yourself of leaches is to swipe the tail out.

I had some wannabe Armstrong try that with me up Kingsway one day, locked up and slid to the side and he got all red in the face and started swearing.
His unpreparedness/inattention puts me at risk if something serious should impede me.

For consenting adults only, not lazy bum-lovers.