Hell yes. All the time.
Have you ever broken a promise to someone important to you?
Yes.
Have you ever fallen down a flight of stairs?
many a time
have you ever laughed at an inappropriate moment?
Yes.

I find it very hard not to start laughing in complete silence, sadly complete silence is usually only achieved in something like a minute of silence.
Have you ever laughed at something somebody said when they weren't even joking?
Yes. It was very embarrassing that I thought it was a joke and it wasn't
Have you ever not laughed when somebody was joking?
Yes, several times. It really depends on the person trying to be funny.
Have you ever sent a message to the wrong person?
Yes

I sent a message meant for the girlfriend to a guy friend. That made an awkward convo.
Have you ever seen a message you weren't supposed to have?
Yes my co-worker sent an instant message meant for my co-worker to me, and the message was about me.
Have you ever told a joke and forgotten the punchline?