Usually, practical jokes are anything but practical. However, we are compelled by the popularity of these juvenile pranks to present them for you at our usual discounted prices.
(They never work out for me. One time I installed an "exhaust Whistle" on my Grandma's Dodge Dart, but I forgot that she was somewhat deaf, and she just drove away. That was around the time that I put cigarette loads in my dad's pipe and it almost blew his glasses off, but I wasn't there to see it. My mom got in trouble for laughing.