From shooting a US president to show off to squatting at their homes for a week, we take a look at the scariest, wackiest celebrity stalkers. Subscribe for more .\rbr\rbr\rbr\rbrFrom killing John Lennon to stalking Justin Bieber, we count down 10 Scariest Celebrity Stalkers. Subscribe to MindChop by clicking here: .\rbr\rbr\rbr\rbrRead more here: Follow us on Twitter: 10 Creepiest Celebrity Stalker Stories Some fans take their obsession .