Is it whether you have an 'acceptable' Body Mass Index? Whether your wedding ring and engagement rings are on separate fingers or, whether you are wearing 3 eye shadow colours on each eyelid?
If you work for Malaysian Airlines, a recent Business Insider report identified that these are definite concerns.
Thanks to the Ontario Human Rights Code and basic human decency, we are not obliged to worry about these things before going to work. Let us all rejoice.