I once showed up 8 hours late for work. My boss wanted our team to have three eight hour shifts but he kept changing the start times and team members so much no one knew when anyone else was working unless they checked the schedule. When I showed up that day I realized I should have worked the previous shift, and another manager asked what I was still doing there. I picked up a clip board and told him I need to check some things. Basically I just stopped in front of various things, nodded slowly, then drew a picture. My boss saw me and said I was a shining example of what to do.