27% On average, that's how much of every keg is lost to "overpours," mostly due to bartenders tipping beer out of heady glasses.
8:1 That's the ratio of foam to beer in a head once it collapses. But get impatient and dump it out, and iPourIt will charge you for the refill.
$88,614 By iPourIt's calculation, that's what overpours might cost in yearly revenue—money saved when bars monetize the whole keg.
[Image: Flickr user Robert S. Donovan]