Gentlemen, gentlemen.
Your minds are in the gutter. You may think this is some manner of dirty joke, but no, no.
Look at this little girl. Look at her attire.
Take notice of the red and yellow outfit. She is clearly a McDonalds employee.
Or not..
If she's too young to work, but wants to help out, someone may be allowing her to test condiments so that she may feel important.
Hence the mayo.
Seems like the mayo from the person she got it from did not make the cut, an therefore is deemed by this little girl to not be worthy of the McDonalds menu.
Goodnight.