Lindsay Lohan has returned to the L.A. County Coroner's Office this morning ... and this time she arrived with 20 minutes to spare!! Lohan seemed to enjoy her first real shift on Friday ... when she washed soiled morgue linens and scrubbed toilets. But she kicked up a little controversy when she tried to buy cupcakes and burgers for the staff. She later apologized ... claiming she was simply trying to say sorry for being late the day before.