Once it's opened you do.
Close the door! I'm dressing!
The USDA says to throw it out after 2 months in the refrigerator
Bacteria can breed in Mayonnaise that has been opened but not refrigerated, or not returned immediately to the refrigerator. Ingesting bacteria can cause food poisoning, so yes, Mayonnaise (ALL brands) can cause food poisoning if not stored properly.
No, mayonnaise is a condiment.
No, mayonnaise is not a gas. Mayonnaise is a semi-solid or thick liquid.
It depends on the mayonnaise. You can even get egg-free mayonnaise which is equivalent to an infinite amount of mayonnaise for each egg.
Possibly...
Mayonnaise is a noun.
No patick, mayonnaise is not a interment.
mayonnaise
Usually they are about the same.