The Foundation Sacrifice is a spirit from the Ghostbusters RPG's Tobin's Spirit Guide (RPG).
A spirit is weakest when it is far away from the place where its body was interred. The closer it is to the site of the sacrifice, the stronger it gets. At its worst, the spirit's murphy ability can make an entire building come tumbling down (a hairline crack in the foundation suddenly becomes a gaping crevice). At its weakest, the ability can be used in a cruel and sadistic way snapping off the main mast just as the victim finishes a ship in a bottle. The most sadistic spirits manifest themselves on Christmas Eve, when Dad is trying to assemble that expensive new toy that Junior just had to have.