The rockers worked on their 10th studio album in a house in Encino, California that dated back to the 1940s - and Grohl claims the sessions were disrupted by ghouls who messed with their equipment.
Speaking about the ghoulish encounters to Britain's Mojo magazine, the "Monkey Wrench" hitmaker says, "When we walked into the house in Encino, I knew the vibes were definitely off but the sound was f**ing on."
"We started working there and it wasn't long before things started happening. We would come back to the studio the next day and all of the guitars would be detuned. Or the setting we'd put on the board, all of them had gone back to zero. We would open up a Pro Tools session and tracks would be missing."
He explained that the ghosts even recorded their own paranormal material, adding, "There were some tracks that were put on there that we didn't put on there. But just like weird open mic noises. Nobody playing an instrument or anything like that, just an open mic recording a room."
The band eventually set up a baby monitor to capture any paranormal activity - but claim it is sworn to secrecy about the findings - after signing a contract with the property owner, to avoid the home losing its value.
Grohl adds, "I had to sign a f**king non-disclosure agreement with the landlord because he's trying to sell the place. So, I can't give away what happened there in the past but these multiple occurrences over a short period of time made us finish the album as quickly as we could."
The Foo Fighters completed their as yet untitled album last month.