Yea let me tell you

When your joking about a answer to a question but not actually serious about the answer

Yea let me tell you!

tell me now!

The refrain of an adult with a child's level of patience.

"At some point maybe we can discuss it."
"No! Tell me now!"

tell me something good

aka I don't know how to have a conversation so entertain me

Hey, tell me something good