1. Reinforcing the wall or other supporting structure by heavy leaning
2. Vulcan/Spock impersonation
3. Buckingham Palace guard practice
4. Counting lights/floor tiles/beer bottles/balls on or off the pool table
5. Guarding the snack machine
6. Finding the 'stagnation points' in the traffic flow streamlines
7. Mental tensor calculus
8. Inspecting the washroom
9. Intently reading signs/posters/labels, no matter how trivial the material
10. Creating geometrical sculptures out of bar straws