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:
   __ __   ___    __ __  _____   ___ 
  / // /  / _ |  / // / / ___/  / _ \
 / _  /  / __ | / _  / / (_ /  / , _/
/_//_/  /_/ |_|/_//_/  \___/  /_/|_|