Kingdom of Knuffel

I have.

I have never pulled an all-nighter.

I have, many times.
I have never eaten alligator meat.

Neither have I.

I have never seen an owl.

Me neither.

I have never drunk coffee before.

I have!

I have never been 21 before.

Ahaha, me neither.

I have never been to Europe before.

Neither have I.

I've never been on a roller coaster.

I have, and they're so much fun, and oh my gosh, I can't even describe how much I love them.

I have never been grounded.

I have >.>

I have never had a dog bigger than a beagle.

I have! My dog was basically big enough to ride on, at least when I was 11.

I've never played a Tabletop RPG.