I agree with the down votes as far as using the description "stupid", but must admit I feel the frustration. There are so many examples that could have been chosen to utilize this vocabulary, almost all with greater relevance. This actually seems somewhat endemic to the course. Come on team, you've had your fun with the humor. How about replacaing this and other nonsensical examples with useful phrases.
Actually, learning the words in nonsensical sentences helps you understand the word without it's context. Meaning that instead of just learning sentences, which would actually not be useful at all, you are actually learning the words. And that will help with to make your own sentences.
Well if your goal is to learn phrases then you're right, but if you're understanding the construction it shouldn't really matter if the sentences makes sense, so long as it's correct and the elements can be applied elsewhere. Besides, any humor put into the lessons helps me personally stay interested. I think if you're not digging the style here then it's probably more worth your time to seek out a different method of study.
차가운 = cold / object I.e: 차가운 물 cold water
춥다= feeling cold; im cold Person or animal feeling cold
차가운 = cold -> object i.e 처가운 물 = colf water 춥다 = its cold, i'm cold refers to a person/animal feeling cold