Yes, they do.
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.
You can't. Your hair will grow or not grow with or without mayonnaise.
They don't make cheese with mayonnaise
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
A normal bottle of any mayonnaise will not contain 12 eggs. While egg yolks are used to make mayonnaise, the main ingredient is oil, not egg.
If you put mayonnaise in the oven it would get to hot and make a gooey mess everywhere and so for the microwave
Mayonnaise contains egg and mustard, which some people are allergic to.