I'm a Teacher Who Loves Pranks and Can't Stop

I know teachers aren't supposed to be pranksters. Yet here I am, sneaking silly stickers under desks during lunch breaks and covering classroom windows with funny jokes about the principal. The kids love it, they giggle uncontrollably and even start whispering conspiracy theories about me being 'the ghost of pranks past.' But now the vice-principal is onto my shenanigans, and I might be in trouble if she catches me red-handed again. Am I just a kid at heart, or am I crossing a line? What should I do when the urge to prank strikes next time? Is this normal for someone who cares about kids but doesn't want to get fired? Or is it just my way of making the school day more fun for everyone?