You don’t choose a target for Cornered Crook’s ability at the time it triggers. Rather, a second “reflexive” ability triggers when you sacrifice an artifact this way. You choose a target for that ability as it goes on the stack. Each player may respond to this triggered ability as normal.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.