Sometimes a hiss can be fear, as in 'oh my god this scary hook moster that I've never seen in my life is coming into my house, maybe if I breathe out all the air in my lungs I can look smaller/flatter and it won't see me/try to pick me up and eat me.' They're not super smart creatures, but sometimes they can also tell if you're nervous, and it makes them wonder if there's something they should be nervous about too.
Also what 200xth said on the feeding, little guy might just be hungry and hoping you have some noms for him. Can you get a pic of the head position next time? Just to rule out periscoping vs. stargazing, they can look similar but they have different implications.
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