Simpsons Wiki

Put it down, Bart. Down, Bart. Put it down.
―Abigail, as a result of Bart[src]

Abigail is a former babysitter who had a mental breakdown because of Bart and is now cared for by her sister.

Abigail has gray hair which most likely hasn’t been kept in years. She wanted Bart to put something down at the time she had the breakdown, it is unknown what she wanted Bart to drop, but it is assumed he didn’t.