My cousin's drama teacher did this. But, they knew about it before the test while the teacher didn't know that they knew. When everyone was done, they all stood up and sang bohemian rhapsody together. The teacher gave each student 15 points.
The bathtub planetarium sphere from Sega Toys let’s you do just that. Just dim or turn out the lights and stars are projected everywhere. It will even project underwater scenes, even roses all over you and the room. i would never leave my bathtub