Clock

The Clock is a powerup from The Legend of Zelda. Whenever Link kills an enemy there is a small chance it will drop a clock as a spoil.

When Link collects a clock, (by walking into it) every enemy on the screen is frozen in place, and is unable to attack, (although Link can still sustain damage by bumping into them) while Link begins to flash white to indicate the item has taken effect. It is then easy for Link to kill the affected enemies. However, the clock's power wears off as soon as Link leaves the screen.

One side-effect of the clock is that it renders Peahats invincible, as long as they were moving when Link used the clock. Normally, Peahats are indestructible while they are moving, and only become vulnerable to attack when they stop. When the clock is used, Peahats are frozen in place, and their blades stop spinning. However, the game still classes them as being in their 'moving' state, and therefore they cannot take any damage. In addition, if a Peahat is frozen it cannot change between the two states, and therefore it will remain immune to attacks indefinitely, until Link leaves and the clock wears off.