Backlasher
Stronger, Faster, Browner
Call your business agent and explain everything. He is your best option at getting this resolved in your best interests. If he is worth his weight in salt he can handle it before this guy gets fired. Chances are he will know how to defuse this before this person get canned. This person might be bipolar and need a job where he works by himself.
Say he's Bi-polar. If he works by himselves, (pun intended), will he throw boxes @ 1 each 1 of himself & run to & frow dodging & throwing boxes?
What a funny sight.
We should promote him to manager & give him a Cafe avatar with the name UPSSOCKS 2.0
I wonder, if he was a driver if he could also give himself safety rides & yell @ himself about safety methodes & production.