Sometimes you will get a warning, something like “Daaaad, I don’t feel good.” Or you may just get the faint sound of a liquidy burble before the event. A bomb is about to go off in your back seat, usually some putrid combination of chicken nuggets, PB&J and juicy drink. It’s not a matter of if, but when.
Source: LifeHacker – How To Handle Your Kid Getting Car Sick