02/10/2012 05:09 am ET

Harry Potter And Voldemort Play Plead The Fifth On 'Watch What Happens Live' (VIDEO)

Voldemort asked and Harry Potter answered on "Watch What Happens Live" (Weeknights, 11 p.m. EST on Bravo). And it was just as weird as when Voldemort donned fluffy slippers to read erotic fan fiction on the show.

Before playing "Plead The Fifth" with his onscreen nemesis, Daniel Radcliffe told Andy Cohen about the sinister side of being famous: attracting stalkers. One particularly obsessed fan used to draw arrows pointing to Radcliffe's crotch on photos of the actor and then mail them to him.

However, Radcliffe may not be above a bit of stalking himself given the right circumstances. When Cohen asked which celebrity he'd stalk, Radcliffe picked the newly single Katy Perry. "Not even in a 'I'm a really big fan,' way, but in an overtly sexual context."

Next up was Voldemort (sans pyjamas), who kept up the creepiness by asking, "If you could cast a spell to be invisible, what actress' bedroom would you want to sneak into?"

"Scarlett Johansson. 'Cause I reckon that's the only way I'm getting there," joked Radcliffe.

Catch all the latest celebrity scoop on "Watch What Happens Live," Weeknights at 11 p.m. EST on Bravo.

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