Can anyone explain the joke?

Which organ is the meme referring to? And why? Because the picture is referencing muscles, I think?

The girl (acc: iAmJordi) just pulled the phone out of a drawer and used it. Nothing else 😭

Some people in the comments are is asking about the cold and small part but nobody explains it. I don’t get it.

Edit: title is wrong. It is cold and small part

A character in the book describes this shirt as “very funny” but I guess I’m too dense to get it.

In the Monty Python sketch 'The Funniest Joke In The World', the Germans try to make their own joke that goes like this:

"Zer ver zwei peanuts, valking down der Straße, und von vas assaulted... peanut."

Is this an actual joke with wordplay or just nonsense?? I have been thinking about this for literally weeks and cannot discern a meaning 😭 Thank you!

Is the doctor stalking the lady because she has big ears? My family has been trying to figure this out and none of us get it.