You brush your teeth with them twice a day. Also police could spot bald tyres from a distance. If the rubber of the tyre was made of a mixture of hard and soft rubber then the soft bits would stick into the dimples in the road and stick better. It scrapes nasty stuff from your teeth. It makes your teeth feel clean and smooth.
People often have to pick out stones from the tyre treads.
We could make a 'tread comb' to make this easier and encourage people to use it to make their tyres last longer. We could make it so it only fitted the tyres we sell and so our customers would be pleased by how much longer our tyres lasted. Things to watch out for when using the technique You must be careful not to decide that a specific word is of no use and getting another instead. Again, the skill is to work out HOW the word can be made to fit. Be careful not to create too many steps between the random word as a stimulus and the creation of a relevant idea, or you may run the risk of ending up with an idea you already know works.