Reusable gel packs. These are cold therapy packs which contain a form of gel and are kept in the freezer until required. They are reusable and in many cases can also be heated either in very hot water or a microwave to offer warm therapy instead.
A clown car is a prop in a circus clown routine. A common example of such a routine involves an implausibly large number of clowns emerging from a very small car, to humorous effect.
The clown tends to take the most ridiculous or tragic course of actions, so at times can remind us of our own misdirected path. Sometimes the clowns face or clothes are a disguise for pain or sadness, or that you feel you have been made a fool of, or paraded in front of others in a way to be ridiculed.