Block show the default VtigerCRM Confirmation box to let them decide something.
You could configure the text, the User see.
This configuration result into this in Frontend:

Enter your comment. Wiki syntax is allowed:
   ___    __ __   _  __  _____   ___ 
  / _ \  / // /  / |/ / / ___/  / _ |
 / , _/ / _  /  /    / / (_ /  / __ |
/_/|_| /_//_/  /_/|_/  \___/  /_/ |_|