Saturday was party time at Phantasialand theme park near Cologne, as thousands of people flocked to the annual gay pride celebration Fantasypride.

But organizers will have suffered the hangover from hell on Sunday morning after finding the entire receipts of the weekend missing, according to reports in Bild.

The festival was jammed full of live music, DJs and even a wet t-shirt contest, but the main drama came from an unexpected source.

A pair of partygoers enjoying the Phantasialand park in Cologne. Photo: Fantasypride

While the festivities were still in full swing at 11pm on Saturday night, a devious burglar duo managed to break into the ticket office via neighbouring buildings.

They then smashed a hole in the wall in order to get past the alarmed door. It didn’t take them long to make the big heist, as they knew exactly where the key to the safe was hidden.

The entire profits for the festival were inside the safe, and so the burglars got their hands on around €1 million.

By the time the guards discovered the break-in the next morning, the culprits were long gone. The police did not want to reveal whether the thieves were caught on CCTV footage.

At this early stage of the investigation only one thing seems clear – that the burglar duo must have received help from somebody on the inside, because they knew their way around so well.