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:
  _____  _____   ____  _____  ____ 
 / ___/ / ___/  /  _/ / ___/ / __ \
/ (_ / / (_ /  _/ /  / (_ / / /_/ /
\___/  \___/  /___/  \___/  \____/