Do you have an idea? I have twenty. On inspiration and crankiness, by Harini Nagendra

Not "where" do you get your ideas, but HOW? Do they come to you as images? Memories? Overheard conversations?

One of the professors in the institution where I did my PhD - the Indian Institute of Science - was infamous for his habit of deflating students, puncturing their excitement and generally running them down. 

"XXX!" one of his students was said to have shouted, running towards him down the long stone corridors at top speed, waving his hands. "I have an idea." 

XXX sneered at him. "One idea? ...