Not only do they all quit together, they do it at the worst possible time.
When DH were newly married, we volunteered to host Thanksgiving for his family. Small gathering, just about 10 people, but naturally our oven AND ancient hand-me-down microwave both died that morning. No heat at all from the oven, and terrifying sparks and buzzing from the microwave. We ended up doing the cooking at a nearby friend's house, who was out of town but gave us permission to "break in" (she told us where to find a hidden key) and use her kitchen. Thank goodness for sharing friends!
I made sure to "forget" an "extra" pie in her 'fridge as a thank-you!