The Scientific Method

A scientist was demonstrating his latest research to a group of scientists at a science symposium. He had trained a spider to follow voice commands.
"Spider, go forward"
The spider began walking on the table.
"Spider, go left"
The spider turned left.
"Spider, go right"
The spider turned right.
Just to prove it wasn't a coincidence, the scientist said "Spider, do a backflip"
The spider did a backflip. The audience was agog. No one was exactly sure what they were witnessing. It was truly astounding and a very important moment for science.
Then the scientist pinned down the spider with a surgical implement and sliced all of it's legs of with a scalpel.
"Spider, go forward."
Nothing. The spider just, sort of, twitched.
"Spider, go backwards."
Still nothing . "As you can see, when we cut the spiders legs off, it loses it's sense of hearing completely."