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A powerful item
Pull up 4 large vegetables in Super Mario Bros. 2 and the 5th plant will be a Stop Watch. It will appear for a second and then freeze everything and everyone temporarily. If you need any Small Hearts, this is a good chance to kill some enemies so it can appear.
The Stop Watch is later seen in the Paper Mario series. When Mario uses this item, if it works it will immobilize enemies for a few turns. It can be bought at most stores and it is a fairly common item.