Double-button.

Ah, the infamous double-button flush mechanism. It has intrigued and captivated. Even baffled and fooled scholars. For years.

Shrouded in mystery, rumors fly about this little device. Does the big button create a bigger flush? Or is this some kinda optical illusion where the little guy unleashes a fury of roaring, rushing aqua washing your business below?

After tedious testing, they both expel about the same damn amount of water. But that doesn't mean that they can't change their minds. Next time, our results might shock and surprise you. Unpredictable. Simply unpredictable. There are no sure bets here.

But we have found miniscule insight into the nature of this beast from a distant relative, believed to be of the same genus. The equal-sized button double-button flushing machine. And if you look real close, the button on the left has a larger drop of water than the button on the right. But we've yet to determine if these rules hold true for the non-equal-sized double-button flush mechanism, or if it even means anything here. In these early stages, all signs point to ancient plastic etchings being meaningless.

Seriously. No one's figured this one out yet.