I have always wondered why of all the stems, this particular one was so odd. Perhaps it was an abnormal seed I planted. No...I did a general search about leaves..and found similarity to the distortion...bug attack!
Link: http://urbanext.illinois.edu/bugreview/aphids.cfm
Another good link - Know your garden bug: http://www.thefarm.org/charities/i4at/lib2/gardbugs.htm
http://www.krishiworld.com/html/bhindi.html