As well as your joke, it might be helpful if you could comment on the sig as well.

The Text is very hard to read. Colours are blending in with the background. Since you have used a shadow on the entire sig, it might be a good idea to apply this effect on the sig as well.

One thing that I can see is that the glow is too overpowering. It draws away alot of the major details and makes it hard to view.