Everytime we go to TESCO we get static shocks from the trolleys. They are awful, you can even see the sparks and hear the noise when it happens.
It is known that we build up electrostatic charge as we walk around, and while we push the trolley, its wheels can also generate static electricity, store charge and reach a high voltage.
Inside Tesco, after they refurbished it, the new trolleys associated with the warm dry air and the floor covering are making these effects worse.
Next time we go shopping, as we walk around, we will keep trying to push those weird new trolleys against some metal in order to discharge the static electricity before we get electrocuted.
You can read more about static electricity here.