This isn't a new one or particularily funny, but there is a Honey Bunches of Oats commercials where all the workers are talking about their favorite version. This lady in a paper hair net thing says, "It's like a mouth full of joy!" and she makes me smile every time she says it!
Also, the 8 year old in me loves this local NYC area commercial. I guess it's for oil for heating your home. I only pay attention to the jingle at the end "Call 1-800 I've..Got Gas!!!"