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.
In the sentence The car went careening into the ditch, the preposition is into: it's the word that points to the noun. We love to chase kids around the carnival in our scary clown costumes has two prepositions, around and in. They tell you where things are happening.