Falling Knife
The stock dropped from $100 to $73, so now it's cheap...right? And you wake up the next morning and the first print (at 10:17) is $57.
This stock ain't done fallin', baby.
Step in to buy it here at $56.80, and you're trying to catch a falling knife. Better wait 'til it's in the $20s, or has at least stopped demonstrating the effects of gravity on a high flier.
Knives, like an ex's sharp gaze, can cut.