Have you ever played Monopoly, Receiver? This is worth having. The Bearer of Get out of jail free is offering the Receiver a consequence-free mistake; to cut them some slack, next time they do something offensive or problematic. Such a gift requires a certain amount of trust in the Receiver not to abuse their licence: an Unwise – or even a malevolent Evil laugh - in response suggests such trust might be misplaced, and It would be wrong declares such a gift inappropriate. Thank you and You rock!, however, thank the Bearer. Trust me speaks of a Receiver convinced they are unlikely to need such permissions, or prepared to respect limitations, and I'm yours or Only you suggest the Bearer is all that matters to them in any case. Who, me? proclaims possibly spurious innocence and Don't make promises you can't keep doubts their ability to keep their word.