A pic from one of my favs, Money Money Money!

These are definately the three episodes I willnever forget and will never get tired of seeing :
Episode 6 of Tenchi Muyo! : We Need Tenchi

Why : Washu is awakened, Tenchi gets his foot stuck in a dimensional tunnel and, once again with Washu, says some hysterical things. (Like when she calls Tenchi a guinea pig.)

Episode 19 of Tenchi Universe : No Need for Runaways

Why : This is the episode witht he hijackers. Washu forgets all lines, Kiyone fills them in, not to mention, Tenchi leaves Ayeka and Sasami at a restaurant and doesn't realize it until they've gotten Yagami back and escaped the Galaxy Police.

Episode 5 of Tenchi in Tokyo : Money, Money, Money!

Why : This is the one where Ayeka, Kiyone, Mihohsi and Ryoko go off to Tokyo to make money. Of course, all plans fail and when Ayeka and Ryoko catch Tenchi with Sakuya, all may not end well, for Ayeka and Ryoko that is.