Superbowl Sunday, at least. Bad Astronomer Phil Plait posted nicely on this, so I will proceed to my flattery forthwith.
You had to pay $2.4E+6 to have a 30-second spot run during Superbowl XLI. Federal Express shelled out its cash for this catalog of science misconceptions.
But when FedEx delivers a lemon, I say turn it into a lesson!
Read the Bad Astronomy post for Phil's well-articulated objections. Then use this student worksheet and show the clip in class. Students really do enjoy ripping these things to shreds, and many will be inspired to be on the lookout for bad science in other ads, too.
Maybe we should pass a hat to fund more ad/"lessons" like this one!