well heres my tweaker invention. take a 2 liter bottle an cut a hole in the lid and in the plastic near the top, make one hose go into the bottle so its at the bottom an one coming out the top. this sorta works off the basic bong idea. but the water, put some incense oil in it an some potpourri in it. wat fer ur dad to go to bed, cut a slit in ya window an slide one tube out the window an the other is so u can blow the smoke into an out tha 2 litre. i did this shit when i was tweakin an mad sketch bout my PO comin by at 3 in tha morning, lol. so if it worked then it should work for u. u can alwayse jus light an incense like we did back in tha day b4 my probation officer but then again my dad wasnt round an my mom could care less