I used to have a large beanbag in the back of mine for the extra people. Obviously it wasn't overly legal.
Got pulled in for a RBT blitz one Friday night coming home from the movies with 8 people in the car. Had 4 coppers walking around the car checking number plates and rego stickers. Everyone in the back was laying flat on the floor still as a rock and we got through ok. My clutch leg was shaking with nervousness a bit. Lucky I didn't stall it taking off ( or worse, chirp the tyres)