My dad is sometimes sly now. Middle sister coerced my mother into taking my dad for an evaluation. Apparently my father became irritated at the tester asking him a bunch of questions he couldn’t answer, so when she stepped out for a moment, Dad slipped out of the room and hid.*
It took them half an hour and a Code Yellow to locate him, because he’d stand behind a half-open door, and when he saw them check one room and move on, he’d slip into the checked room. “See how they like not knowing the answers!” he told me later, gleefully.