I got a flash drive for my brother and did gag gift that one. Put it in a box that my PSU came in, threw an old dead PSU in it for weight, found another box a bit bigger and put the PSU box in there, and then put that box in an even bigger box with packing peanuts and a random old computer mouse for a noisemaker. And of course the use of duct tape is mandatory.
He'll never know.