Stubbing your toe
An ulcer/blister on your lip or in your mouth
Wanting another xbox 360 kinect but realising you dont have a mansion
Seeing people at work who have been there half the time you have and they are a few rungs on the ladder higher
Wanting to save up but then getting invited to another party/trip away etc
I do that on an almost monthly basis. I've twice done it on my Dyson after my cleaner or decorator has moved it slightly. I think I must walk through the house on autopilot when on the way to the toilet in the middle of the night and if anything is even an inch out of place I risk injury.
Place is upside down at the minute as it is being decorated so I expect a few broken toes over the weekend.