Are your kids Star Wars fans? Superman? Indiana Jones maybe? If so (or even if not), you might enjoy this John Williams tribute. This fellow, Corey Vidal, is lip-syncing (and doing a fine job of it, I might add) to the Moosebutter quartet vocals. Knowing about the lip-syncing might spoil it a bit for you, but maybe you'd rather find out sooner rather than later. If not...well, sorry.
EVEN STILL this is just really fun.