There are many approaches that can be used on a rounded nut or bolt. Many of them depend on the access you have to the nut. If you have easy access you can try using Vice grips, a pipe wrench, or a...
You cannot fall of the moon, well maybe you could if you had the leg strength to jump 2.3 kilometers high, that is the height necessary to exit the moons gravitational pull, which i think no man,...
Feel very sorry, perhaps weep. Consider you should have visited the vets and promise to do so if it similar circumstances arise in future. Dispose of the body.