Neither have I.

Never have I ever burned myself tending a fire.

Neither have I.
Never have I ever colored my hair green.

Neither have I. I've never dyed it at all.

Never have I ever spent more than a hundred dollars on one item (excluding household appliances and vehicles).

Ummm I have lol.
Never have I ever only been able to spend one cent on something.

Neither have I. Wish I could though xD

Never have I ever remodeled a room.

Neither have I.
Never have I ever knocked down a door.

Guilty, and for no reason other than to prove that I can. xD

Never have I ever tripped over my own feet.

I have lmao.
Never have I ever pushed over a goat.

Neither have I (though I did accidentally knock over a cow xD).

Never have I ever fallen into a pool.

I have lmao.
Never have I ever ate a raw squash.

never hehehe
Never have i stayed up all night for an event?

Aha neither have I..

Never have I ever found a snake in the yard.

I have!

Never have I ever seen an alligator in the wild.

Neither have I, seen them captive though! Even got to touch one. :3

Never have I ever fallen down the stairs twice (on the same set of stairs, at the same time).

Never twice... once was enough though
never have i been drunk..

I have...

Never have I ever broken a window.

Never.

Never have I ever failed a class.

I have...

Never have I ever hated a job.

I have!

Never have I ever stolen a book from the library.

I think I technically did. I left elem school with a book still checked out... xD

Never have I ever been scared to watch horror movies alone.

I have.. A very, very long time ago. xD

Never have I ever hit someone with an object.

edit: Oops. This one, I have done!

Never have I ever had to run in heels.

Ive never HAD to, but I have for fun? xD

Never have I ever been bit by a fish.

Neither have I. Eww~

Never have I ever fallen in the shower.

edit: Ninja, but my answer stands. I have.. tangled up in shower curtain and all.

Never have I ever run from a bear.