IKEA wobble 

(noun.) the characteristic wobble that's in every piece of furniture on display at IKEA, due to one or more of the following factors:
a) too many people sat on it/tested it out/touched it
b) it was assembled incorrectly
c) it's just bad quality (aka cheap) in general)

I assembled and re-assembled this table five times already and it still wobbles. It must be the IKEA wobble.

IKEA wobble by helium cash February 22, 2009