Generate a question about the following movie plot: Tom is sleeping near the fireplace, but sees Jerry sneaking past him. Jerry goes up onto the dinner table and tries to reach for the food, but Tom whacks him with a knife and Jerry retreats, running up the staircase. Tom pulls the carpet off the staircase to catch Jerry, but also pulls down a large upright piano. While Jerry dodges, the piano squashes Tom to death. Tom's spirit ascends to the "Heavenly Express", a train that sends dead cats to Heaven. Several cats are waiting to enter, including Butch, who has lost a fight with a bulldog, Frankie, who was struck with a flat iron while singing on a backyard fence, Aloysius, who was run over and flattened by a steamroller, and Fluff, Muff and Puff, the trio of cats who were thrown into a river and drowned as a result of Animal cruelty. The gatekeeper allows them all through as their deaths were untimely, but refuses Tom because he has persecuted "an innocent little mouse" (Jerry) all of his life. Tom is given a certificate of forgiveness for Jerry to sign to board the train which leaves in one hour. If he fails, Tom will be banished to hell where the devil (Spike) awaits. At first, Tom thinks it was all a dream until he sees the certificate and a clock appears with the gatekeeper warning him to hurry. Tom pleads Jerry to sign, bringing cake, but Jerry eats the cake quick and sprays the pen's ink into Tom's face. Then Tom tries to forge Jerry's signature, but the gatekeeper stops him ("Thomas! Ah ah ah-ah-ah!"). Then Tom brings a cheese, but Jerry tears the certificate, causing Tom to get angry, grab Jerry and attempt to smash him just because he refuses to help him. The devil pops out and reminds Tom of the consequence of doing so, tempting him to finish the job. Tom explains with him before he ripped the certificate and Jerry signs it, but he misses the deadline and the escalator disappears. He then falls into a hole that directly leads to Hell where he will be tortured by the devil. But then it is revealed that Tom was actually dreaming and he finally wakes...
The answer to this question is:
Jerry is crushed by what instrument?