Thanks to rude hip-hop stars and friendly rodents, there's been a whole lot of photobombing and subsequent Photoshopping going on recently. But before you grab that magic lasso tool on your favorite image editor of choice, you've got to think of the perfect image to alter. This can often be hardest task, and the defining humor in your creation.

Often, some of the most iconic scenes from history are the ones to get 'shopped --- here are a few that we've seen pop up under time and again.

1. First Moon Landing

Photobombers love to steal Neil Armstrong's thunder.






2. Abbey Road

The Beatles' classic cover art often has unexpected visitors.





3. The Last Supper

There just aren't enough seats at the table, you guys!






What other images get 'shopped most often?