Heavier

"As she raised a glass of water, everyone expected they’d be asked the “half empty or half full” question. Instead, with a smile on her face she inquired, “How heavy is this glass of water?” The answers called out ranged from 8oz to 20 oz. She replied, “The absolute weight doesn’t matter. It depends on how long I hold it. If I hold it for a minute, its not a problem. If I hold it for an hour, I’ll have an ache in my arm. If I hold it for a day, my arm will feel numb and paralyzed. In each case, the weight of the glass doesn’t change, but the longer I hold it, the heavier it becomes.”"