Have mercy! John Stamos helps man propose to Full House fan

San Francisco, CA -- Doug Cox wanted to propose to his girlfriend, but he needed some help.

So the California man solicited actor John Stamos.

Apparently Cox's girlfriend is a bit obsessed with the Full House star and even keeps a framed picture of Stamos in her living room.

Stamos happily agreed to help out Cox and posted a video online.

You can see how the proposal went down in a post from Cox's Facebook page.

Have mercy!

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