There's no business like somebody else's business. Will finds this out one day when he walks in to see Grace on the floor and with her ear pressed to the vent, so she can hear what the neighbors in the place underneath them are up to. At first he scolds her. Then, of course, he jumps right in.
The two become so hooked on eavesdropping that they just hang out there all the time, with pillows and blankets and everything. And boy, is the news ever interesting: the downstairs people are cheating on each other. That makes the spy mission even more wrong. Not to mention, more fun.
It takes Jack butting in to make them stop. You know you're someplace weird when Jack McFarland is the voice of reason...
A funny episode about jealousy, hypocrisy and taking advantage of someone else's pain...it's great, isn't it?