if you gently kiss the bumper in front, something like releasing brake slowly roll brake roll brake, and gently kiss the car bumper in front.
Assume the following scenarios,
1) totally no scratch, no dent, no visible damage at all
2) very slight scratch
3) slight dent of maybe size of 50cents
will the driver in front able to claim from you in any of the above scenario? eg. change bumper, re-spray bumper.