Possibly, if you have a weird definition of 'pretty'
Mayonnaise with pretty spoon.
No. There are hair products that that use the word "mayonnaise" in them but it is not the mayonnaise you eat.
You don't usually need mayonnaise to make pancakes.
One of the main ingredients in mayonnaise is vinegar. It is pretty acidic. If you have sensitive skin, it could have inflamed it a bit.
You can't. Your hair will grow or not grow with or without mayonnaise.
They don't make cheese with mayonnaise
Yes, they do.
To make a pickle-mayonnaise topping, chop a pickle into small pieces and mix it in mayonnaise in a bowl before spreading it on a sandwich.
Sitting down
the yolk
probably not
no not at all fruits and vegetables do