Coffee-shop boredom...
Espresso-cup bunnies:

Very popular with kids at Easter.

Abusing the whiteboard:

(understaffed, Saturday, Rugby)

Granola Bar cricket:
Bowling a granola bar to a batter armed with a poster tube, mop, or other similarly shaped item.

Wheelie-chair jousting:
Requires a store with a large office or outdoor area. Two players use only mops or brushes to propel themselves on office chairs, trying to topple the other player when in range.

ISI Javelin:
Using an empty cream canister charged with ISI gas, players propel marker pens as far as they can. More charges may be used (with care) for a more explosive result. A variation on this is Cream Roulette whereby players take it in turns to aim canisters at the face, one being charged with cream.
(cherrygloom could kick your ass at Guitar Hero any day, Thu 8 Jan 2009, 21:18, 2 replies)

I'd happily shag 80% of the people in that first photo
Just in case you were wondering.

excluding the Simon Pegg lookalike and the featureless head in the background
( chart cat has an itch, Fri 9 Jan 2009, 8:07, closed)

You should definitely
...visit Starbucks more often then. Your eyes'd be out on stalks.
(cherrygloom could kick your ass at Guitar Hero any day, Mon 12 Jan 2009, 15:17, closed)