Of course you know it is going to happen. You get out on the bike for the commute to work and remember you forgot to get that damn under the seat bag that has your tools, tube, and co2 pump. You tell yourself it isn't going to happen. There's that strong head wind, there's the rain in your face, and your shoes are soaked, you've tempted the fates enough that a flat on the way to work isn't going to happen.
Yep, shamefully I journeyed off on my ride to work sans the necessary equipment for a repair of a flat tire. And not only did I get a flat, I got two flats: front wheel and rear, so even had I remembered to bring the under seat bag, it wouldn't have done me any good. Five miles from work I wound up walking the bike to work, and laughing at the incredulity of it. I've been really lucky, no flats in a loooooonnnnnggggggg time. So, two in one ride isn't too bad. But I learnt me a lesson, that bag is going with me, it sure wards off evil snake bite spirits.