Uno Attack

This Uno variant, where instead of drawing cards when you can't play you push a button on a device that might give you no cards or might shoot out like seven, is a big hit with kids (or at least it is with mine and their cousins). It's somehow always funny whenever it beeps and spews a bunch of cards onto the table. (It also has extra card types that make it easier to dump a lot of cards at once, to offset the fact that you can also get hit with big influxes of cards.)