發送短信 : Why do we choose the color red for danger?

 _____       ___      _  _      ___      ______  
|  __ \\    / _ \\   | \| ||   / _ \\   /_   _// 
| |  \ ||  | / \ ||  |  ' ||  | / \ ||    | ||   
| |__/ ||  | \_/ ||  | .  ||  | \_/ ||   _| ||   
|_____//    \___//   |_|\_||   \___//   /__//    
 -----`     `---`    `-` -`    `---`    `--`