[bridgetroll]

when, because of diminishing returns, one reaches the margin where wasting time is no longer providing significant benefits (such as feeling better).

[iamdave]

Fun became "useless" when we started analyzing it, poking and prodding it.

At the same time, apps became useless when people started making "apps" like Vampires, Mob Wars and called them "applications" instead of 'games'.

What a beautiful game of wordplay we play.