yeah i had similar things happenwhen i was at school- misjudging the amount your smoking and going into class completely baked with all your mates in class clocking you in about two seconds. nightmare. this one time i had Geography and id gone out for a cheeky lunchtime spli then went and sat in our common room and everyone was coming up to me and saying i better have a free period next cos i looked fucked! i went to the class and just literally sat there staring at this sheet of paper for the whole 45 minutes! im not sure if my teacher realised or not but if she did, she obviously was quite chilled about it cos she didnt say anything about it.