1. Open a new document by clicking on File -> New.
2. Click on properties palette on the bottom to show it. You can also open properties palette by selecting it from Window-> Properties.
3. In properties palette click on background and change the background color to black by clicking on black color.
4. Hide the properties panel to increase the workspace and make sure to zoom your document to 100%. Change first layer's name to 'Danger'.
5. Grab type tool and type 'S' (capital), set font to 'windings'. This will create a symbol of drop on screen. Resize it to an appropriate size.
6. Click on drop and press ctrl + B to break this symbol. You can also use Modify -> Break Apart as an alternate.
7. On Color Fill select Red Black gradient color to fill in the drop.
8. Select frame No. 20 of the same layer and press F6 to extend its frames. Being on the same frame take type tool once again and type 'N', make sure font is set to windings. The danger symbol should appear on the screen. Now position this symbol exactly below the drop but half inch a apart.
9. Selecting danger symbol press ctrl + B to break it apart. Then select Red Black gradient to fill in danger symbol.
On frame 20 delete the drop symbol.
10.Click frame 1 and on properties panel find the tween option. Open the combo box and select 'shape'.
Similarly on frame 20 again select 'shape' in tween option.
You can download source file here.
