Obi-Wan's "Certain Point of View" argument came in handy many times, and not just with Luke...

"Sure, Officer, you say I was doing 78 in a 50 parsec zone - but what is a parsec, anyway?..."

"Oh baby, you know I'd like to stay, but it's not you, it's me - But hey, let's not point fingers here.."

"Well, sure, it's really convenient to tell me I have a tab at the bar after I've drank all this stuff, isn't it?"

"No Yoda, you totally said I could take this power converter - you didn't say 'borrow', you clearly said 'take'..."

"Those aren't the Sabacc chips you're looking for...You didn't have the winning hand....move along..."

"Well I see your point about this being your droid and all, but he was just being helpful for a few weeks at my place..."

"Owen, Owen, I gave you guys a whole KID - and now you want the money back you say you leant me? I think you're trying to take advantage of me..."

"Only a Master of Evil, Darth...and perhaps Master of several legions of Imperial troops and..well...Master of the Imperial Fleet...and you have some pull at this battle station....but...well....mostly just a Master of Evil..."

"Luke, I know they gave you 4000 for your speeder, but you can't just expect me not to get a commission, now, really - would that be fair?"

"Whatever, Yoda - you can say 'I told you so' all you want, I still managed to at least injure my opponent. How's the Emperor, hmmm? Mr. Big Shot?"