Would you be upset if you had to finish someone else's work everyday?

Okay so I work at UPS at the customer counter. I work the pm shift which is 4pm to whenever I get done. Here for the past 2-3 weeks, the morning clerk has been leaving a bunch of stuff for me to do because "he ran out of time and can't finish them".  Numerous people I have talked to said there's no reason he can't get it all done. His fill in guy I do not have this problem with.  But yet I get yelled at when I vent to people about it because "I don't understand how busy it is in the morning"!  I'm just as busy in the evenings when I am having to do his stuff and being 30 weeks pregnant in the sometimes heat. Am I over reacting or should I be pissed?

Vote below to see results!