Black eye wonderscope
Just ask a friend to have a gaze through your amazing kaleidoscope. When they look though and press it to their eye it will leave a black ring that imitates a black eye. Whats better? They won't even know!
At the jokeshop we like to play a little game and see how long it takes our victim to notice. Trust us they they got a lot of strange looks and it gives us a good laugh.