To determine what you get when you cross a thief with a cement truck or a supermarket with a jungle, you can use your imagination to create a fictional scenario. When crossing a thief with a cement truck, you might imagine a situation where the thief attempts to steal the cement truck, leading to a humorous or chaotic outcome. Similarly, when crossing a supermarket with a jungle, you can envision a place where a supermarket is situated within a dense and wild jungle, resulting in a unique and adventurous shopping experience. These combinations serve as creative exercises to imagine amusing or unexpected scenarios.