You do. The interesting thing about paracetamol is that toxicity arises at only about 3 times the maximum daily recommended dose. For a drug which is perceived as so safe it's common for someone to continue downing them when they're in pain and become quite sick. Certainly a problem of education, not the drug itself.
It surprises me people would just 'down' any medication. I've always stuck strictly to the very clear instructions on the box (I believe it's 2 every 4 hours, no more than 8 within 24 hours for paracetomol) and everyone I know does. Reading through this thread though it seems like a lot of people seem to be confident enough to play doctor and decide what they should/shouldn't take and what is good/bad for them. Maybe it's a cultural thing but everyone I know is pretty careful with even 'staple' medications like this or NSAID's.