Oh my goodness. My kids these days are really teaching me about patience and helping me develop more!
I remembered a lesson I learned as a kid, "If you have a crab put it in water" This was in reference to getting a hermit crab to stop pinching, but it works just as well for people.
When you are feeling really short tempered and cross (thanks to Grandma for reminding me of that word) take a shower or a bath. When your kids are going to drive you up the wall- put them in the bath.
It really works. There is something about water that is so inherently soothing it can help relieve stress and tension. It works for sick kids (and teethers).