It's an age old question, debated by sages and philosophers for centuries: What would happen if you put "Harry Potter" stars Bill Nighy and Domhnall Gleeson together in a time travel caper? And now, thanks to The Telegraph, we finally know the answer: You'd get the first trailer for the new indie rom-com "About Time."

You would also get solid confirmation of Rachel McAdams' time travel fetish.

McAdams, you may recall, played the spouse of a time traveler in the aptly named romance "The Time Traveler's Wife." And this time around she is again being wooed by a chronally challenged suitor, namely Domhnall Gleeson, who is probably best known to most fans as Bill Weasley from the "Harry Potter" films.

Which also makes this a bit of a reunion, as Nighy — who plays Gleeson's doting dad and mentor in timefoolery — is also a "Potter" alum, having memorably portrayed doomed Minister of Magic Rufus Scrimgeour.

So will the two make movie magic once again in "About Time?" Check out the new trailer and see for yourself. And trust us: When it comes to your own timeline, this will be 2:28 well very spent.