Last year we noticed that the trunk light in our '11 335is turned itself after some undetermined period of time.
My wife came home from work one day, opened the trunk to unload it, and then saw the next door neighbor out in front, so she went over to chat. I went out some time later because I heard that she was home but hadn't come into the house yet. When we walked back to the garage, the trunk light was off. Just to make sure that the trunk light hadn't burned out, I closed the trunk and when I opened it again it came on. I didn't know that it did this. We've since confirmed this on at least a couple other occasions. I definitely didn't know it was known as "workshop mode".
(Did you spill something in your trunk?)
Mine: 2006 Z4 Roadster (E85) | Interlagos Blue Metallic | Black Extended Nappa Leather | Carbon Leather Trim | Purchased 7/19/12
Hers: 2011 335is Coupe (E92) | Le Mans Blue Metallic | Black Dakota Leather | Dark Glacier Aluminum | 6MT | ED 5/12/11
Also Mine: (On Order) 2016 M4 (F82) | Sakhir Orange Metallic | Black Full Merino Leather | CF Trim | M DCT | Adaptive M Suspension | 19" Black Alloy Wheels | ZEC | ZLP | ZDB | ED 5/13/16