I had a flat on my way to church. I put in a new tube, and my pump would not work! I tried putting a drop of chain oil in the pump head, and that fixed it!  I had to pedal extra hard so as not to be late. I got there on time, but I was dripping wet with sweat. It took a long time to get cooled down!

Water bottle leak finder

I got a flat on the way home from church.  I could not find the leak, so I stuck the tube in the water bottle.  It worked!  I was able to find the leak and patch it.