Cock Blocks

A post in the worst thing you've ever said to a girl thread inspired this...

I'm in my 3rd year of college right now, and for some reason this year seems to be really bad for me in getting the old cock block.  I mainly contribute this to:
Fat Chicks

I can't even tell you the number of times they have fucked me over.  You guys know exactly what I'm talking about.  And you know that every group of girls has one.  She's like the responsible mother figure, that never seems to have any fun at parties or the bar.

They're attitude is that "since I can't get laid, my friends aren't allowed to get laid either".  You'll be taking shots and dancing with her friends.  And at Midnight she's the one that says, "Hey guys I'm not feeling well I'm going to head home".  Well heres the thing... thats her ploy.  She really isn't feeling all that bad.  She knows that if she leaves, her friends will come with her.  Out of fear of being called bad friends.  And by the time they get her back home and she sticks her fingers down her throat and pretends to throw up.  It's 1:30, and the other girls might as well go to bed too.

Another variant of this is the classic non-aggressive cock block, "Overly Drunk Fat Chick".  Instead of pretending to be sick, this chick actually turns pre-game into the-game, and drinks until she's sick.  Her friends show up with a nice buzz, and she's stumbling and slurring her speech at 10:30.  And when she stumbles over to the bar, for some reason that shot of 151 looks a lot more appealing than that miller lite.  Surely her friends must take her home and hold her hair back while her face is in the toilet.  Oh god... and whatever you do... don't let her "sit down and rest" on your couch in your room.  She'll be there until 2PM the next day.

And finally... the worst kind of cock-block ever... "Fat chick pretending like someone said a rude comment to her".  Not only is this a sure-fire way for her and her friends to leave, but it pretty much ends any chance in the future you have.  Because you'll be known as "the douche".  If you say to her "my cousin goes to UMASS" soon it will be that you said "wow you have a big ass".

I don't want to sound like an asshole or anything.  I'm actually really nice to all girls, even if they aren't very attractive.  I'm a decent guy.  This has just happened to me so much that I'm about to loose it.

What are your thoughts, comments, and personal experiences?