Two (2) aliens walk into a bar

Well, they're probably not aliens in the traditional sense, as flying through the vacuum of space would require a sufficiently advanced ship allowing them to survive that experience, which would beg the question of why they'd be just walking into a bar... but nevertheless, whatever they are, they have a very apparent two (2) of them, and they are walking into a bar.<br><br>This is based on a standard "Two (2) X walk into a bar" joke, where two of something walk into a bar and do something funny. But this time the joke's on you, because I'm blanking on the rest of the joke.<br><br>So your mission, should you choose to accept it, is to fill out the rest of the joke.<br><br>This has been a Writing Prompt from an alternate universe.