Derek is generally a pretty stoic, rational, calm and serious guy. He treats everything he does in life with the utmost respect the situation deserves, so while he generally wouldn't go so low as to pull off ''pranks'', he'll generally buy into the idea if presented by some of his own teammates when he can see value in them. Often times, it would have to do with team bonding, getting the good vibes back after a tough loss, breaking in a rookie to make them feel part of the team, and more good reasons. So while there isn't one specific thing in which he finds pleasure, joy, enjoyment and laughter, its the general idea on a more meta and philosophical level that gets to him. If there was something to really point out specifically as to being a thing he enjoys, call him beige, or basic, or uninteresting perhaps, but there's some level of comfort in the all time classics, and Derek knows you can generally never go wrong with a quality whoopee cushion on a chair!