This insulated travel mug is designed to be completely spill-proof, only release its contents into your face after you've pressed a button that allows you to "sip from anywhere on the rim." From the pictures, though, I can't quite tell where the button is. I hope it's not on the top.
Nevertheless, for sloppy slurpers or caffeine addicted trapeze artists, the $25 price may be less than punitive. (Although I have to say that this looks like the sort of design that, if effective as claimed, will soon be co-opted by knock-off vendors soon.)
Catalog Page [Hammacher.com]