If only they had number plates
Not enough exercise. 100% guaranteed.
I hate to admit it but for a long time I had meltdowns in 2 situations, telecom customer service and flat tires starting out into the desert. I've never had a meltdown near the end of a ride and it's not because I never get flats at the end of a ride.
Fortunately the only record or evidence of any of my melt downs, at least in this hemisphere, is a stomped creosote bush.
Both issues have been solved.