How do I get my videos to be popular on youtube?

improvise i love the miley & mandy show just because we are able to see how crazy miley is in real life lol...but post alot of video replies to their videos alot of their viewers look at the video replies so just video reply saying "hi miley and mandy i just wanted to say hi or w.e" and then start doing your stuff you probably will get alot of views but make your videos interesting not like them just staring or doing crazy things they get that much views because they are celebrities but improvise something put costumes and pretend to be artist act crazy people always want to laugh at something huh?