Backbone jokes

I got fired for not doing enough work.

Guess I didn’t put enough backbone into it.

Papyrus: Sans, stop being a lazy Bones.

Sans: Why bro, guess you don't have the back bone to do anything, heheh.

A skeleton walks into a bar and said it takes "backbone" to mess with me, and if you try to insult me, I have thick skin.

My friends say they don’t like my skeleton puns.

I should put a little more backbone into them.

My friends hate when I make skeleton jokes. I guess I need to put more backbone into it.