Want to freak out all of your friends? Just start using this glass around the crib. It'll look like you have lost half of your pint! We don't know if they'll be able to figure out exactly how you accomplished this feat (It might be particularly difficult for them if they've been drinking) but we'll know your secret and we're not telling anyone! Just a hint of advice though, you won't want to use this glass at the pub. You won't be getting a very good value for your dollar!