every one dose this at my old highschool i just graduated from that or they write in pink or yellow (thats what i did but i wrote a note to my bf using yellow jell pen and he was highly irritated he couldnt read it lol)
OH! OH! OH! I GOT ONE!!!!! draw doodles in a notebook that you have to turn in to a class that has to do with the actual notes you're supposed to be taking. (i.e. history: cannons were invented specifically to break down walls. *in the corner draw a small man shouting "FIRE!" next to a cannon)
draw doodles on homework for a class, if the teacher asks why, say you got your art notes mixed with (class) notes once again.