I forgot what I was calling about

I heard a good radio advert tonight. It advertised pills that will immediately improve your memory, make you mentally sharper and downright smart. I am not currently taking the pills so I am only 98% sure that the product advertised was called MemoryMax. The best part is that they guarantee your money back if the pills don't sharpen your faculties. The problem I anticipate is that I'll call them and want my money back and they will refuse - because I'm obviously sharper now than I was when I ordered their pills in the first place.