Well, I'm sure no crew would be happy to be delayed by a nervous pax who thinks the wings will "fall off" because they're flexing up and down at every bump in the pavement.
If you actually act in a way that will force a return to gate for no good reason you might end up being escorted off premises by the police and later charged.
If you clearly witnessed a collision with another aircraft or ground structure or actually saw a piece fall off the wing than by all means act as crazy as you can in order to prevent the plane from taking off, even if you are not in a position to evaluate whether there was any actual damage and to what extent the damage might interfere with the safe operation of the aircraft. Any such occurrence needs to be properly investigated prior to the aircraft being returned to service. You cannot be blamed if upon later inspection it is determined that there was no damage or the extent of the damage did not make the aircraft unairworthy.