It can be funny sometimes, but persistent trolling can be a really serious issue. Trolling is manipulative behaviour for personal gain at he expense of others- malice and selfishness of the highest order. Really severe trolling (depending on the subject matter) doesn't just ruin people's forum experience but can have real implications with vulnerable people, or people with an autistic spectrum disorder like myself who aren't always sure if people are saying why they really mean or put up with a lot of teasing/bullying offline. You never know the true consequences of your actions towards someone at the other end of the computer screen until it's too late.