Make a lung with an empty coke/fanta bottle. Make a hole (scissors, knife, pencil, lit end of a ciggy...) in the end of the bottle, then make another hole on the opposite side at the top. Stick joint/roach in hole at bottom, cover up top hole with finger, breath in til its nice and smokey in there... then release finger and breathe in deep.
I will give an ounce to anyone who can clear a FULL 2 litre bottle of smoke in one hit, without puking. Do it without coughing, and you can have a pound.