Fun indeed. Unfortunately he'll probably only get offended and completely miss the part about you subtly trying to prove a point.

If only we could _counter_ their "that's easy" with a similar statement of our own thrown back at them...

Something like;

-Hey Mr. Developer we need to implement feature X. I think it's a 5 minute thing really. You only need to Y and then we're set. Should take an hour or less. Probably less if you just insert and if statement in module Z.

-Sure thing Mr. Manager/Sales/What-the-heck-do-u-really-do-around-here-anyways-guy. But may I ask... Do they [the customer] really need this feature?

-What do you mean? They asked for it specifically and besides they're paying us in gold.

-Well instead of implementing this feature can't we just convince 'em [the customer] that they really don't need this feature and would actually be better of paying us 10x what they do today? That's just simple sales and accounting! I bet all you need is a phone call. That way we could play Pong all day AND make more money.