Roy Halladay photobombs unsuspecting fan

Fans photobomb celebrities all the time, but this time retired Phillies pitcher Roy Halladay was the one having a little fun.

Halladay tweeted a photo at an amusement park where he is standing right beside a man wearing a Halladay Phillies t-shirt.

Only inches from the unsuspecting fan, he took the photo without even being noticed.

He then wrote: "Oops! You missed me! Walked right by me! Hope he gets to see this pic with me on Twitter, doesn't know we took this!"