"Flight delayed after passenger becomes suspicious of equation"
http://www.bbc.co.uk/news/world-us-canada-36240523
"An Italian economist says his flight was delayed after a fellow passenger saw him working on a differential equation and alerted the cabin crew."
"The University of Pennsylvania associate professor boarded the Philadelphia-Syracuse flight on Thursday on his way to Ontario, where he was due to give a lecture.
Before the flight took off, the woman sitting next to him passed a note to a member of the cabin crew.
She initially told them she was feeling unwell but then voiced her suspicions about Mr Menzio's scribblings."
My first sentiment is, 'Please don't let that paranoid passenger have been a Canadian. '