none said:

^ RotS Han child concept sketch

Hmmm... so Chewie and Dumb Kid Han Solo both knew Yoda before Luke met him... AND before they knew each other?

Yoda must be some kind of galactic match maker... except that he almost set Luke up with his sister...

But seriously, I guess you don't need Ghost Ben Kenobi in ESB anymore...

Luke: I'm just not sure what to do as a Jedi! I wish Ben were here.
Chewie: [Nrahahawah.]
Han: He's right, Luke. You should just go hang with our main man Yoda for a bit. I'm sure he'll set you up.
Luke: I wish I could... but how could I ever find him?
Han: Chewie, where's your space cell phone? I know you still have that gantsta on speed dial!
Chewie: [Guffahashahwah] (takes his space phone from that pouch he always wore and hands it to Luke).
Luke: What did he say?
Han: He says he's part of his 'favourite five' so it won't even use his minutes.