pxt-calliope/docs/reference/input/on-gesture.md

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# On Gesture
Start an [event handler](/reference/event-handler) (part of the
program that will run when something happens) This handler works when
you do a **gesture** (like shake, tilt, or drop the micro:bit).
```sig
input.onGesture(Gesture.Shake,() => {
})
```
## Example: random number
This program shows a number from `0` to `9` when you shake the micro:bit.
```blocks
input.onGesture(Gesture.Shake,() => {
let x = Math.random(10)
basic.showNumber(x, 100)
})
```
## Lessons
[bounce image](/lessons/bounce-image)