"It's a slippery slope..."
This one is used to crush any minor change to improve a rule or a law. "Maybe we should force people to prove they know which end of the gun fires the bullet before they are allowed to purchase one."
"No way, that is just a slippery slope to government taking away anything that shoots or has a sharp point!"
Bull shit...that kind of thinking is a slippery slope to Moronville!