A good prank can make the time fly by at the office, so check out these 25 ideas for some excellent inspo! Offices can become a little dull – after all, they're a place we spend 40 hours per week, doing the same activities with the same people. So why not liven things up with some harmless pranks? As an intern, I was once assigned to make jello in order to imprison someone's stapler inside. After trekking out to buy jello packets, my boss and I made jello and let it chill overnight. The stapler…