why a spare tube and a patch kit?

Well lets say that you are thinking about lunch and remember that the new Jimmy Johns about a mile and a half up the road dropped off coupons for a free sub last week and you have one on your desk. And your new permanent crown just got put on this morning. So off you go to get your sandwich, and when leaving you realize the back tire has flatted. Unload the bike and get the tools out, change the tube. But you were in a hurry and didn't get all the glass out of the tire, and the tube flats again in 50 yards. fortunately, you have a patch kit, several swear words, and a cell phone to explain why you be a little late coming back from lunch.

I was also reminded that I hate my planet bike mini pump, and am ready for a new one.