He took his pills from the wrong end
There is a lot of stigma surrounding older people. When they go out to have a good time, younger folks look at them weirdly or even make fun of how they look. That is why many choose to stay at home and find their own ways to entertain themselves.
This eighty-year-old man was probably bored one afternoon and decided to do something he would later regret. The worst part is that he denied knowing anything about this, but the truth is that pill bottles do not end out of thin air in your rectum. Maybe he was trying to take his pills from the other end.