This is a Western Barred Spitting Cobra (Naja nigricincta). During molting, our little friend needs to drink water. So YouTube user Частный экзотариум feeds him water from a glass. Then, after he's back in his tank, he gives him pats on the back. So apparently cobras are like dogs in that they liked to be petted.
Despite the similarity, I think that I'll stick to dogs.
-via Gifsboom
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When a snake is getting ready to shed, the scale over their eyes becomes opaque (see pic above). Since the snake's sight is impaired, it is more likely to defensively strike at any sudden movement. Even your long time pet will do this.
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