Occasionally I will stop to help bike riders broke down on the road. While mainly flat tires I also see broken and sucked chains and derailleur cable problems. What seems to almost be a trend is many of these cyclist turn their bikes upside down to try and find out what's wrong. If they ask for help the first thing I do is right the bike mainly because I can't mount a rear tire on an upside down bike. Is it just me, or is there a correlation between those that don't know how to work on or fix their bikes and those that turn it upside down on the road?