4. Vanishing white spray
Now, don’t get me wrong. This works, but people are talking about it as if it is a genius invention.
If you don’t know what I am referring to, referees at this summer’s World Cup all carry round what is effectively a can of shaving foam so that they can mark temporary white lines on the pitch.
Refs mainly use this to stop walls encroaching at free-kicks.
It doesn’t magically ‘vanish’ though, it takes a good few minutes to fade away… naff.