My hair is really curly, and I thought it just wouldn't be very easy to get it to do it, but it ended up being far easier than I could have imagined--easier and quicker than most hairstyles.
First I put a leave-in conditioner in, then I do that whole "blow-drying it straight" thing--if you have curly hair you know exactly what I mean--it never makes it "straight", but it makes it point in the direction you want. You do that on your whole head, not having to be absolutely thorough. Then you take some really concentrated gel that turns hard, and lightly frisk your fingers to put your hair into the typical mowhawk shape--a tall triangle--it happens very quickly--if you start with too much gel, it will NOT work--you must put only the amount that temporarily keeps it in that place. Then use a blowdryer over each side, being careful not to blow it from the topside--only the sides or the underside. If you didn't use much gel, this shouldn't take long. If you used too much gel, wash your hair and start over again.
Now just spray your hair with your hardening hairspray of your choice. Now do the same thing with the blowdryer, but it should take a very short time to take effect.
Viola. it's done. It doesn't actually take very much product to keep it up like that in contrast to what it takes to keep truly straight hair up like that.