Evidence to Support Denial

I was doing some thinking over the holiday.  Many times, there are cases where a party denies something they have no actual defense to.  I remember a car wreck a few years ago where the party denied liability although they ran a stop sign and my client was the passenger. This is a time where interrogatories to request information to support their denial can be helpful.  On the case mentioned above, the party quickly stipulated to liability once it was made abundantly clear sanctions were in order if they stuck with the denial in discovery.