mad scientist pour
verb phrase
To pour contents from one partially-depleted container into another similar partially-depleted container and feel like a mad scientist while doing it.
Carole had a habit of accumulating mostly empty water bottles on her desk. She had developed a ritual for consolidating them at the end of the day, lifting them up to eye level and mad scientist pouring one into the other. She only cackled while doing it if no one was around.