Trust us: you won’t fancy a pint of any of these concoctions.

Colin FarrellandBrendan Gleesonare pulling back the curtain on one very seriousale-ment that they’ve struggled with throughout their careers.

“Everything was ghastly,” Gleeson shared on a recent episode ofLate Night with Seth Meyers.

Brendan Gleeson and Colin Farrell

Brendan Gleeson and Colin Farrell reveal the ingredients of fake movie Guinness: ‘All sorts of unspeakables’.Jeff Spicer/Getty Images

“It was actual cream…”

Farrell then interjected, “Grape juice with cream!

All sorts of drinks you shouldn’t be mixing.”

I mean, Il faut souffrir, they say.

It’s important to suffer… for art.

And this was suffering."

“Thank God for it,” Farrell swore.

“On the production, we would’ve had to drink just an unutterable amount of [bleep].

And it’s not [bleep].

It’s actually really tasty.”

“It’s delicious,” he said.

Watch Gleeson and Farrell share movie industry drink secrets above.