Moshe R., a Flatbush insurance professional, was preparing Shabbos after his wife had given birth. “Things were proceeding smoothly, until I reached for the ringing phone and instead, absentmindedly grabbed a sharp knife, cutting my hand deep enough to require five stitches. As the blood oozed forth all over the kitchen, I did my best to wrap the wound, and then whisked my toddler out the door for an Erev Shabbos visit to a local urgent care doctor.