Now that US Airways is planning to print ads on barf bags, it's time to take a look at the full potential of this valuable bit of airborne real estate. Thanks to Matthew Stibbe at Bad Language for alerting us to Airtoons, the parody airline safety messages (tagline: "Please Familiarize Yourself or Perish in Flame"). Hold the cursor over each picture to see an alternate caption. Warning: some of these messages are rather naughty. Not to mention snarky.