Prophet Mohammed (Peace be Upon Him) taught us about business ethics and how false advertising - making incorrect claims about the product we want to sell - hurts the business. Even if it appears to be increasing sales, it is damaging in the long-run.
“Avoid swearing falsely in order to sell your goods. Apparently it appears to be promoting your business, but in fact it lets your business down and damages the goodwill of your business.” [Muslim]
I have selected a few Ramadan ads that I personally like.. I'll let pictures speak for themselves. Which one is your favorite?