if the person next to you lines up the lid with the "sip hole" arrow when they put it on they're a coppic.twitter.com/yPDSiVS4tT
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
It's just opposite the seam, and if you don't do this, there's at least a 10% chance the coffee leaks on your lap at the seam in the rim.