1) The story opens, "When Gregor Samsa awoke in his bed one morning from unquiet dreams, he found himself transformed into an enormous insect." When you first read those lines, did you find them humorous? When did you begin to understand the serious intent, or did the fantastic or surreal situation make it difficult for you to take the story seriously?
I read those lines entirely seriously. The fact that Gregor is a bug didn't startle me because, although his reaction was extremely unreasonable, I knew exactly what the novel was about before reading it. It also doesn't help that most characters in novels are more like caricatures than they are like actual people, so Gregor's lack of shock didn't surprise me. I knew that Kafka was painting a portrait of a man whose most important trait was illustrated by his under-reaction to his metamorphosis. The story was serious from the very first word.
4) Among Gregor's responses to his transformation, we see anxiety, frustration, and surprise, but not shock. Why doesn't Kafka present Gregor as being horrified by the discovery that he is an insect?
Kafka establishes Gregor's unusual bug-like personality immediately. Instead of focusing on the obvious fact that GREGOR IS A BUG, instead he focuses on things that no logical person would focus on in that situation, such as his inability to go to work that day (just the way that the reader would expect a bug to react to a grave situation, nonsensical). Gregor's mind is so preoccupied with everything but his own well-being that he can't focus for even one instant on the clear and present danger that he is in. This is why Kafka neglects Gregor's shock reaction. If Gregor reacted in the same way that a normal person would react, the reader would assume that Gregor is also a normal person and the character of Gregor is meant to illustrate more than just a story, it's meant to exaggerate certain characteristics in the hopes of making some comment on the self-destructive tendencies of over-conforming, just like in Gregor's case.