Never, I reapeat never knock the bong over! This is a serious party foul and usually will get you kicked out of the smoking session. All this does is get nasty bong water all over the place and makes everything smell like a combination of resin and bongwater (not the good stink) If you do make this mistake, be the first to get paper towels and cleaning supplies; and always make a genuine effort to clean up. People will usually forgive you if you are cool about it. Remember nobody likes someone who makes a party foul and then acts like a dick after. Also, dont put the bong on the ground! It is always a good idea to keep it about waist level and on a sturdy table.