Some say it’s good luck if a bird’s droppings hit you, but not if the bird is an airplane and the dropping is frozen human waste that crashes through your roof.

Marian Liknes was sitting in her Calgary, Canada, bedroom in the middle of a phone conversation when chunks of ice consisting of toilet water, antifreeze, disinfectant and human waste tore through her roof and landed on her bed in a pile of shingles, plywood, drywall and insulation, CBC News reported on Thursday.

The crash, which she said sounded like an explosion, left a foot-wide hole in the roof.

John Lee, a Transportation Safety Board manager, confirmed the waste came from an airplane lavatory and said that the release may have been caused by warm air triggering melting.

He said the plane would be tracked down to avoid future mishaps. "This is a one-in-a-million chance of something like this happening."

Click here to read more on this story from CBC News and to view a picture of the droppings.