As in the Phil Collins song "Can you feel it coming in the air tonight".
There I was with 4 passengers on board driving into town when one of them farted and it really stunk so down come the windows and no one would admit to it so at the end of the journey the fare was £3.80p on the meter and so I asked for £4.80p.
Obviously they asked me why I wanted £4.80p to which I replied that the extra pound is for an air freshener.
I expected them to not pay it and personally I wants bothered if they didn't as I was just having a laugh with them but they took me seriously and paid me the extra pound and apologised.
This got me thinking,. Maybe if I could fine everyone who didnt behave in the cab then I could be rich within a week.