Here's a glass that's perfect for teasing someone who's prone to having one too many.

The Kanna Glass by Hiroshi Yamazaki (of Yamasaki Design Works) is a beautifully designed piece of glassware, with an unusually irregular bottom. The uneven surface means that it will never rest flat — the glass will always be tipped at a slight angle. It also makes it inviting to roll the whole thing around the table top, just for fun.

The Kanna Glass is priced ¥2,700 and can be ordered online via Kimura Glass' Zizi webstore.