[throwaway2331]

They're not accidental.

They stick a metal rod, that's been frozen in liquid nitrogen, into the piggy's heart.

This kills the heart cells.

Then they stuff the piggy into an MRI machine and take a picture of its heart -- because an alive piggy's heart beats and makes the picture blurry.

Then the scientists get a pretty picture on their computers and high-five one another.

Success, they all think: "mission accomplished. Funding secured."