  We consider $O(N)$ $g\varphi^4$ theory with the coupling $g$ being large, and
calculate shear viscosity to entropy density ratio ($\eta/s$). The final result
for $\eta/s$ has a form remarkably similar to that obtained from string theory
calculations via the AdS/CFT conjecture. The method adopted can be used to
compute quantities of interest in other theories as well with some
modifications and reveals some very interesting features within the considered
theory.
