When news broke that Katy Perry and Orlando Bloom had broken-up, John Mayer decided to reach out to Katy by sending her 100 red roses with a card that read, "I'm here for you."

It's been rumored that John wants Katy back and thought this might be his opportunity to reconnect with her.

Instead, Katy told her assistant to donate the flowers to a nursing home and to send a picture to John so he could see the elderly residents with his tokens of love.  

Basically, it was a "thanks but no thanks" move...BURN.  

[Source]