After being investigated for his blog post, Cory Doctorow sent this FOIA request to the FBI

Last week an FBI special agent rang up Cory Doctorow and told him he had questions about a blog post Cory had written in July about a Popular Mechanics article on the physics of toppling statues. Wisely, Cory put the FBI agent in touch with an attorney at the EFF and the attorney convinced the FBI to stop the foolish investigation immediately. — Read the rest