A Levittown, Pennsylvania family says their daughter's Sweet 16 birthday party was ruined when a passing airplane dropped human waste on the celebration Sunday evening.

Joe Cambray, the birthday girl's stepfather, said he was playing some horseshoes in the backyard when out of nowhere, something nasty rained down on the gathering. Thankfully, a canopy erected for the party shielded most of the guests.

Luckily, they had just gotten done with the cake....chocolate I presume. If they weren't done with it by then....they certainly were after.

The family has filed a complaint with the Federal Aviation Administration after Rogy used a smartphone app to figure out there were five planes overhead at the time of the incident, she said. The FAA told the TV station it will investigate the incident.

Believe it or not, airborne waste problems are reported with some frequency.

In 2012, a New York couple said they were splattered with airborne waste from an airplane as it flew overhead.

In 2013, a woman in England reported that a frozen chunk of waste had crashed through her roof.

Last year, a New Zealand woman whose home was pelted with what she says was human waste from an airplane was furious when the country's Civil Aviation Administration tried to blame the mess on ducks.

The FAA's term for frozen airplane waste is "blue ice," after the chemical that's added to toilet water to help deodorize and break down waste. Usually, ground crews dispose of the waste once the plane has landed. The agency acknowledges that lavatory leaks can occur in the air, but says the usual culprits behind fly-by poopings are flocks of migratory birds.

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