>>13416697quite a few, it's the basis for a lot of machines like TNT cannons, pearl cannons, etc.
Here is a video showing it off a bit, but if you're willing to wade deeper into the autism that is minecraft on youtube you can find some really insane machines:
https://www.youtube.com/watch?v=ZFlA0W8DGXYNote also that in minecraft, if TNT detonates while in water, it doesn't break any blocks (but will still do damage to the player and will throw other entities (including other primed TNT) with speed proportional to how many primed TNT you packed together.)
