Granted, humor in its rawest form is purely subjective. As it stands though, I could only find this vaguely amusing, it certainly didn't make me laugh.
Games that I find funny are usually more like Portal or Psychonauts, the latter in particular actually making me laugh at loud at some points.
I guess what I'm saying is, you may find those scenes funny but I didn't. I mean no offence to you, after all there is no 'right' or 'wrong' about humor subjectively. Just that to me personally, I didn't find this very funny.