"You can give people a good scare when you show up in the attic," Sirius said, when he walked down the stairs. "And you can be one hundred percent sure that you don't apparate into another person, that's always tricky. Of course if you want to scare someone, you shouldn't shout before you show up." The last bit was added as an afterthought and Sirius looked quite puzzled when he reached her bedroom.
"And I walk down the stairs with any of them all the time. It's safer than apparating. If they pull your hair at the wrong time, you have a problem." Maybe he should just cut it off?