Hopefully Pinky will become thinner by exhaling and pull herself out. As for jokes, if you look what makes people laugh is always the unexpected element.
Like 1, 2, and 4. Skipping 3 and jumping to 4 is unexpected, a twist. And therefore might be funny.
I don't try to be funny. What help is to listen in to other people's conversation and noticing colorful dialogue. It sticks and can be used in a cartoon.