It’s so big we can see it with a telescope, and so small that the chance of something similar hitting any single spot on the surface minuscule in the next 100 years.
Put a chewing gum in it, push a coin or credit card atop it, for a fast fix. Use Fantastic Fast Foam by Lunar Meta Materials for more permanent repair.
My son wanted to wear his undies on the outside a la Captain Underpants and I tried war gaming this with him - hmm, so your undie on the outside is going to require another one inside your pants and we are out of fresh pairs etc etc. In the end, he gave up on the idea of mimicking Captain Underpants.
To address this question, apply a mathematical trick, and convert it to the equivalent "Why aren't happy people smarter?". This new question admits a range of straightforward solutions, depending on how kind you are to the handicapped.
For the rest of the world, this is ~222 meters, more than twice the length of a 100 meter track.
EDIT: Ninja'd! :-)