There was trouble this week on a South African Airways flight when Uganda's economic monitoring minister, Maurice Kagimu Kiwanuka, claimed that he was the victim of a new form of apartheid. It was "shocking, crude and embarrassing! All the passengers were sprayed as if they were carrying bedbugs or lice. To me, this is a new form of apartheid created by these people to mistreat others. We don’t carry bedbugs to be sprayed.” said Minister Maurice.
Spraying inside a plane often carried out and usually there's an announcement about it. Maybe the minister was dozing at the time?