Not to be confused with the Timer.
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A Stop Watch from Paper Mario:TTYD.

If Mario or his friends first pulls up four large vegetables in Super Mario Bros. 2, pulling up what would normally result in a plant will instead reveal a Stop Watch. It will appear for a second and then freeze everything in the level for a few seconds. This gives a window of opportunity for Mario and his friends to defeat enemies and collect small hearts. However, touching the frozen enemies still hurts the player, but they will stay in one position and not move at all.

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A Stop Watch from Super Mario Bros. 2 (left) and Paper Mario.

The Stop Watch later appears as an item in Paper Mario. When Mario or his partners use it, it will immobilize enemies for a few turns (assuming it is successful). It can be bought at most stores and is a fairly common item.

A few years later, it appears in Paper Mario: The Thousand-Year Door. Here, it is a somewhat rare item, for it can only be purchased in Twilight Town or Fahr Outpost. The item will immobilize enemies, just as in the game's predecessor. However, enemies can also use the item against Mario or his partners. Several warped clocks appearing in various colors will appear on-screen after using the item. After about four seconds, the item takes affect and immobilizes its prey.
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