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Manufacturers universally tell you to refrigerate mayonnaise once opened, though, because it helps preserve the flavor. Warmth causes mayonnaise to break down after a while, and it gets to the point where it just tastes oily. Homemade mayonnaise, of course, is a different matter. With its use of raw eggs, it is highly perishable and should be consumed immediately or refrigerated and finished off very shortly.
If the pineapple is canned and unopened, it doesn't need to be refrigerated. If it is canned and opened, pour it into a container with a lid and refrigerate it. If it is a fresh pineapple, you won't need to refrigerate it until it's a few days old and getting a little too ripe. Cut the pineapple from the core and store it in the fridge in a covered container.