I used to live an hour's drive from my work in the city...got all suited up one morning and didn't realise 'til I hopped out in the car park near work...I still had my slippers on. Had to drive all the way home and get my work shoes...'phone and explain I was running late and then drive back into the city for a mid morning meeting....From that day on I always kept a spare pair of shoes in my cabinet at work.