Read the poem. My Cat A bump of black and white Is purring in my bed. And later on at night I find him near my head. The pillow quakes and quivers Like pudding on a plate. He wakes me up at midnight. I sure hope he sleeps late! Read these lines from the poem again. The pillow quakes and quivers Like pudding on a plate. How does the simile affect the mood of this poem

The question is incomplete and the full version can be found online.  

The mood is lighthearted because the comparison created is silly.

Explanation:

A simile is a figure of speech that proposes a comparison of two different things to create a more vivid description of something. In this example, the reference to the pillow shaking like "pudding on a plate" creates a playful image of the movement of the pillow caused by the cat.

The comparison is simple, not difficult to understand. And the mood, despite seeming a reproach to the cat, is not angry. It´s not happy either, as the author gets disturbed while sleeping, but the reproach is playful and still warm.

often a noun phrase is just a noun or a pronoun:

people like to have money.

i am tired.

it is getting late.