If you've worked at enough places, you haven't seen it all but you get an idea of just how low a company's administration will stoop to save face, cut corners, fire people, prove a point or serve their own purposes. If you have any doubts about your average company's amorality, then you just haven't seen some of the shit we have. Black Friday's same day layoffs, 25 people personnel cuts, etc. it doesn't matter how hard you've work, what dues you've paid, who's ass you've saved or what you've sacrificed for the good of the company, you don't matter, you are cannon fodder and you will get cut before higher ups because that's just what happens.
So this brings me to asking you to read the title of this post and live that lesson. If you are handed a contract that "is just a formality" that "needs to be signed right away" or that deals with "tedious portocols", ask for a copy, take it with you, read it, take it to a lawyer and make sure you know what's on the paper you have just been handed. If they say you can't take it or that it can't wait, simply don't sign anything because you are trying to get fucked and they're just sizing you up before sodomizing you with that leafy dildo they want to call a contract.
You see, if you put that squiggly thing that's supposed to read your name in some ilegible symbology you use to establish that you agree with what is said on the paper, well Í just said it, you're basically agreeing to everything that's put forth in the contract. True, there are extremes you can't cross but there are a great many rights you could possibly waive by signing a document.
Oh and in case you're thinking that if you sign something fucked up in a document that you can take it to court, well there's two problems. 1. That's a hell of a weapon you just gave them in the court of law and 2. they have more money than you and can force a stalemate until you run out of money to pay for your legal bills.
So do yourself a favor. Next time you're asked to sign something that is as easy to understand as quantum mechanics, don't sign it. You'll thank me later.