Yes! It's a No.

I do not think you are able to survive in the corporate world for more than a few years if you do not have the skills to say no.

The general observation is that the more, successful years you have behind you, the better able you are in saying no. The no can range from the extremely subtle, where your requester walks away happily without even realising that you have effectively implemented your no, to the extremely pronounced, that leaves no room for ambiguity. Whichever the case it might be, it's a no.

And no, there is not going to be any picture for this post :-)