Cute funny cap for the World's Sweetest Pop is the perfect gift for a brand new dad or a neat Father's Day Gift. Is your Dad a real sweetheart? Here's The perfect gift for him. You can customise by substituting a different brand of his favourite soda pop for cream soda if you like, for instance, "Diet Cola." (Careful, though, you can't use brand names, like "Coke" or "Pepsi.")