A friend did that using some headache-inducing gifs, when a company failed to pay him for work he’d done on their site. Only he could access the site at that point, so they soon coughed up. 8)
Mr Smith offers some sensible comment re ‘image rights’. In the UK, individuals generally have no ‘rights’ if they are ‘incidental’ to the scene depicted; it’s only if you then present the images in a commercial context which would be using their ‘image’ as being an identifiable individual. It’s a tricky one. But in essence; if you’re part of a crowd in a general crowd scene type shot, you have no real rights (other than those specified at any private venue). But for stuff where it’s clearly you, you’d need to have signed a model release form before the image can be used in a commercial context. In the context of journalism, you have no rights if the image is merely stating a fact. So if you’re pictured in a political protest, and you didn’t want your picture to be splashed all over the media, tough.
As for model rights; a friend’s son has his face splashed all over some billboards surrounding a new housing development. He signed the release form, not having fully read the T+Cs, and is a bit miffed, because his fee barely covered his haircut. 😆 A lesson learned there, but ‘models’ are generally exploited.