Lego's. My parents dropped off about all my toys from when i was a kid, i recently moved into a new house and finally had the room to store all my stuff. One night my wife comes home from work and on the dinner table was a huge pile of lego's and me sitting there with my tablet where i found a site that has all the building plans, building everything i had. My wife chuckled and said, "well i always wanted 2 kids" eventually sat down and started building too....
Which slightly ticked me off tbh.....it was my lego's.
Nerf guns are my other guilty pleasure...one day i brought my nerf sniper rifle to work, hid behind the vent pipes on top of the laser cutter and started shooting people that came out of the office....took them a good 30 minutes to find where i was hiding.