When teaching W&B, I always included the consequences of exceeding both the forward and aft limits.
As an example of the former, I used a particular accident. I think it was at Miami International. A cargo plane was transporting cattle to South America. Apparently the cattle were not adequately constrained, and had wandered forward in the cargo area. As such, when the plane went to rotate, it couldn't, and ran off the end of the runway. It's been many decades, but I recall the most significant injury was one of the pilots losing a finger. I'll see if I can find any mention online.
I found this, likely the one I was thinking of:
Example 3: Exceedance of forward centre of gravity limit during take off
Convair 880, N5865, Air Trine, Miami International Airport, USA, 16/12/1976 (source: NLR Air Safety Database/NTSB)
The Convair 880 was loaded with a cargo of cows. Following an apparently normal take off run on Runway 09L reaching the rotation speed, the aircraft would not rotate despite repeated efforts by the crew including re-trimming the aircraft to the 'full nose-up' position. The pilot subsequently elected to abort the take off but was unable to bring the aircraft to a stop before the end of the runway. After leaving the runway, the aircraft passed over an area of soft ground, where its nose undercarriage collapsed, before falling into a wide drainage canal. The investigation determined that on take off the aircraft's centre of gravity was some 2.2% of the mean aerodynamic chord in front of the maximum forward limit, due to the way the aircraft had been loaded, and that the crew's weight and balance calculations bore no resemblance to the way the weight was actually distributed.