Dutch traffic bosses have been left seeing red after someone altered a set of pedestrian lights to show a couple having sex.
Every time the light turns green in the town of Nimwegen, an illuminated image of a couple having sex flashes up, instead of the more traditional person walking.
And apparently the prank has been causing traffic congestion - because people want to see the risque image they're pressing the button, even when they don't want to cross.
Transport officials have now launched an investigation how the images was manipulated, with suspected computer hackery being top of the list.
A Town Hall spokesman said: "We are looking at who had access and opportunity"… presumably that will be cross-referenced with a list of people who have a good sense of humour.