The Linux Foundation had tested some people on the LinuxCon about their knowledge.
Would you have known all the answers?
[youtube=http://www.youtube.com/watch?v=eHfymaDHryw]
Update 24.10.2013: They did it again…
[youtube=http://www.youtube.com/watch?v=tOKAe8IO4OE&feature=c4-overview&list=UUfX55Sx5hEFjoC3cNs6mCUQ]