With a straight face,

if you can combine it with a flawless delivery
   you can convince almost anyone.

Sorry,
   my prankster side is showing.

Sometimes,
  when you inspire trust,
   you can't help but play.

Nothing harmful,
  merely for a laugh.
 
Still,
  I guess it could be a lesson,
   one bitterly learned by too many.

Nothing wrong with trust,
  but do not trust blindly.