My daughter is just as obsessed with playing in my makeup as everyone's daughter is. She paints our walls and herself and clothes and me. So I have to do makeup in 30 seconds or my whole house is covered in my makeup, because she'll just take it and run.
Language allows you to implant a thought from your mind directly into someone else's mind, and they can attempt to do the same to you, without either of you having to perform surgery.