Not really a practical joke but this thread made me think of it once again ...
One time on an Ontario bear hunt, we arrived a day early and some of the guys from the previous week were still in camp and just finishing up. One guy had taken a bear and was in the process of having it skinned and we were all standing around watching. The successful hunter happened to mention that another guy standing there with us had also taken a bear. All of us half expected the other hunter to invite us to take a look but the conversation went kind of quiet. Finally one of the guys in our group asked, "Where's your bear?" The guy didn't say anything, he just motioned off to the side, pointing to a Bronco parked nearby. The conversation again went kind of quiet until again, one of the guys in our group finally said, "Well, let's see it - we'd love to have a look at your bear." The guy just sheepishly walked over to his bronco and lowered the tailgate. There in the back of that Bronco was a bear that couldn't possibly be much bigger than a beagle.
We all kind of stood there for a minute not knowing what to say. Knowing the guys I bear hunt with are a bunch of clowns, from the looks on their faces, I knew SOMETHING was coming, but, LOL, I had no idea what. Finally to break the deafening and terribly awkward silence, one of the guys says, "Well, looks like you made a nice shot." At that point I almost walked away because I could just hear these guys doing everything they could to keep from busting out laughing after the "nice shot" comment.
Again, after a few more seconds of terribly awkward silence, one of my buddies finally says, "Well, it'll make a really nice toilet doily." There was no longer any awkward silence ... there was about a 1/2 dozen guys rolling on the ground laughing their heads off.
I did feel kind of sorry for the guy. He knew he had shot what was essentially a cub and he felt bad but I gave him credit for claiming it and doing the right thing.