"Hello. Merry Christmas. Come and follow me."
That's young Alexander Papakostas being lured to his driveway for a big surprise party.
RELATED: Mother of 8, caregiver to her veteran husband gifted massive Christmas light display
Alexander is battling stage three cancer.
So some good elves from the San Mateo and San Francisco police departments dressed up as Santa, Rudolph and Frosty the Snowman to bring him some cheer.
They brought plenty of presents too.
VIDEO: SF firefighters compete in firehouse holiday lights competition
"It's intense going through chemotherapy, blood draining needles, pain. You know, all the stuff cancer patients have to go through. So, if we can do everything we possibly can to bring him happiness as often as we can, that's what it's all about, " said Bobby Thomas, a family friend.
The party continued for a while in his front yard. Some neighbors even joined in.
The gifts were bought with donations from Alexander's family and friends.