Mr. Nutmeg's neighbor can't believe that Heathcliff's pillow is able to defy the laws of gravity.

OR

Mr. Nutmeg's neighbor is stunned that such a flimsy looking kickstand can support Heathcliff's weight.

OR

Mr. Nutmeg's neighbor is inclined to racist thoughts and can't believe that Mr. Nutmeg isn't the proprietor of a Chinese restaurant.