a humbug - When luck hits you like a brick, but you didn’t do anything

When luck hits you like a brick, but you didn’t do anything to deserve it. It’s like winning the lottery but you didn’t buy a ticket.

I got picked for the lunch table with my favorite friends. That was a humbug.

My pet goldfish won a contest. That was a humbug.

I got a free cookie from the teacher. That was a humbug.