It would be no exaggeration to say that Grease has been one of the most consistently beloved movies of all time.

From its catchy tunes to its iconic characters, the movie musical will definitely go down in film history as one of the greats.

Check out this fun, little Christmas reunion the stars of the movie did a while back:

It’s been 40 years since the musical hit the theaters and over the years, the cast has been more than willing to talk about all the naughty times they shared together on set.

Now it may or may not surprise you to find out that the actors on Grease weren’t as innocent as you might expect for a family-friendly musical centered on a bunch of high school students.

The cast has opened up about some of the more mischievous antics they used to get up to behind the scenes of one of the biggest movie musicals of all time.

From “spiked brownies” to “rocking trailers”, the young cast sure had a fun time hanging out between the scenes.

As it turns out, the late Jeff Conaway who played Kenickie and tragically died in 2011 at the age of 60, was something of a ladies man on set.

And, according to reports, he had a huge crush on the star of the 1978 movie, Olivia Newton-John.

But while Conaway mostly kept his attention on Newton-John, Barry Pearl, who played T-bird Doody, said the Kenickie actor also made plenty of time for “seducing the extras”.