Anybody?

anybody have some good jokes, tounge twisters, or sayings to share?

If you understand, say understand.
If you don't understand, say don't understand.
But if you understand and say don't understand.
How do I understand that you understand? Understand!

Betty Botter bought some butter, but she said this butter's bitter! But a bit
of better butter will but make my butter better So she bought some better
butter, better than the bitter butter, and it made her butter better so 'twas
better Betty Botter bought a bit of better butter!

When a doctor falls ill another doctor doctor's the doctor. Does the doctor doctoring the doctor doctor the doctor in his own way or does the doctor doctoring the doctor doctors the doctor in the doctor's way

Sorry, most of the jokes coming to mind aren't appropriate for this website.