What is the worst creationist argument you have ever heard?

I am spoilt for choice, but I think the worst one I have heard was from a YouTube user who said that since human population doubles every 50 years, if we had been around for 200,000 years, as the evolutionists claim, there would be more people than the number of atoms in the universe. Something like that, anyway. I do not remember quite what the figure was which he used.