Broken Bottle Scam
A con man walks around carrying a bag filled with broken or breakable glass and deliberately bumps into a person and drops his cargo.
The mark is accused of breaking the bottle and feels guilty or intimidated into paying for a replacement. There are several variations on this trick. Sometimes the grifter uses eyeglasses, sometimes he claims that the mark broke a bottle of prescription medicine.
Assuming $20 to $40 per successful scam, that's a pretty decent day's wage.