Bike technical issues: 2 times since 2006. Both involved flats on the way home and a tight evening schedule. Called wife for pickup.
Scheduling problems: 1 time since 2006. Late class, missed the last train, rainy night. Called (unhappy) wife for pickup. Never did continuing ed again.
Health problems: 1 time, but that doesn't really count, because I rode back to a light rail station (in a state of vertigo, no less) and took the trolley back home.
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--Ben
2006 Trek SU100, 2009 Motobecane Fantom CX, 2011 Motobecane Fantom Cross Uno, and a Bakfiets
Previously: 2000 Trek 4500 (2000-2003), 2003 Novara Randonee (2003-2006), 2003 Giant Rainier (2003-2008), 2005 Xootr Swift (2005-2007), 2007 Nashbar 1x9 (2007-2011), 2011 Windsor Shetland (2011-2014), 2008 Citizen Folder (2015)
Non-Bike hardware: MX Linux / BunsenLabs Linux / Raspbian / Mac OS 10.6 / Android 7