Wearing a scary mask or something in that sense. And wait for them to be distracted or sleeping . Just go up on whoever you want to prank and scary them. Trust me it's funny and harmless . Don't try this on older people over 60 . They might get way to scared .
Take a raisin and hide it in your hand. Then pretend there's a fly that's flying around and make a big deal trying to catch it and then slam the wall and pretend that you squashed it on the wall. Then take the raisin and eat it.(pretend its the fly)