Watch people get older
Building that has a room that can grant wishes has a dark truth. It cant leave without aging. objects wished for age to dust. a baby that was wished for ages into a kid, then later into an adult (he got back in and later went out) but still with mind of child., then to old man then death.
A line after Mr Fantastic talks to Wanda about Black Bolt's powers...she says "What mouth" before fusing Black Bolt's mouth close has become a meme where he says something else and she asks "what..." and altering reality. This he mentions young woman and she says "what young" making them old