Only come across it whilst tuning the Zonda R around Suzuka - with the front lowered by 20 the car bottomed out under braking into t1: you could tell because the car refused to turn in but dissimilar to common understeer, think locking wheels under braking. There were some audio cues as well I think.
Raising the front by 2 (-18) cured the problem so again, very obvious what was happening.