Calculus performed real-time.
Where I work is in a small business park with small clumps of offices with each clump having its own courtyard and restroom shared among the offices in the clump. Once in a while, while in need of a urinal, I will be forced by the presence of another person, who currently is in need of a urnial but will soon not be in need of one, to use a stall for my urinal-based needs not for my stall-based needs. One particular time when my boarding pass for the urinal had been double-booked and I was given a standby seat in the stall, everything was proceeding as normal (which I’m sure relieves you almost as much as I was relieving myself).
That is when everything changed.
Out of my periferal vision I caught a glimpse of movement. My heart rate slowly increased. Small organs (ones that have no stops, keys, or pipes but still have the gumption to call themselves “organs”) were influencing my decision making skills with the devious addition of adrenalin to my blood stream. Fight or Flight…. my choice? Flight…. well, not exactly my choice. The motion was a fly making what appeared to be a bee-line (even thought it was a fly) for the bowl of the toilet.
My previously mentioned altered state of decision making tracked the fly in the air, a question was asked internally (and quietly, as the other guy was still standing at the Urinal I had had reservations for) and answered with exultation as I modified the trajectory of my stream to powerfully and acurately hose that fly directly into the toilet bowl.
Watch out for my ninja skills.