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LEVITTOWN, Penn. — Some people at a party in Levittown, Pennsylvania got an unpleasant surprise from the sky.

There were about 40 guests swimming and playing horseshoes in the yard at a Sweet 16 birthday gathering.

Out of nowhere, something disgusting began to rain down on the party.

It was human waste.

Human feces was falling from the sky, out of an airplane bathroom.

“We just got done with cake thank God, we took the cake back in, because within two minutes, something fell from the sky, it was brown, it was everywhere, it got on everything,” party guest, Kristie Rogy said.

Luckily, a canopy helped shield most of the party guests.

The FAA is investigating the incident.

Regulations require planes to dispose of waste at an airport, not while flying over a residential area.