Idk..it didn't happen to me yet.....but I don't think I would feel shocked and confused, especially when that thread would have misleading title or was attempt at flamebait....there's a difference when you're making thread to share valid news or appreciate arist like if you're just craving for attention or want to start pointless fights...
Depends on the type of thread. If it's one I've put effort or thought into, it can be rather annoying. If it's something random and out of left field I made in the spur of the moment, without second thought, I accept it and move on.