LSPMartin... I believe some more explanation could be in order.
Dilbert is a comic strip, a sub-genre of static images. It was drawn as we see it, no part of the work has ever been moving (ostensibly. I don't want to think of all the movements people do with their belongings, but you get my idea, I hope.) or otherwise been subject to the physical laws of dynamic objects. By observing the respective ties of the PHB in the last frame and that of Dilbert in the penultimate frame, one could reasonably come to the conclusion that they were drawn with similar considerations, resulting in a similar upwards curve. I would claim it is an astute observation that the tie drawn on the PHB in the last frame is in the same style as the tie commonly seen on Dilbert.