Across the country, police were kept busy responding to everything from egg-throwing to candy thieves.
While one serious Halloween-related incident was reported near Trondheim, where a teenage boy attacked a woman with a knife and axe, the majority of Monday night incidents were more in line with typical teenaged pranks.
In Buskerud, Hurum, Trøndelag and Gjøvik, reports came in of houses being egged and vandalized, while Drammen youngsters targeted a kiosk with fireworks and kids in Hokksund threw a smoke bomb at their school.
And in Sortland, Halloween took a sad turn for two nine-year-old boys who had been out trick-or-treating.
“Two older boys found them at Lamark school, pushed them and stole their candy. One boy was pushed and fell into a ditch, resulting in an injured knee and wrist. We are not impressed by the older boys' behaviour. They should be ashamed of themselves,” police in Midtre Hålogaland wrote on Twitter.
Other ‘tricks' went even farther. In Porsgrunn, it was reported that youths were jumping out in front of cars while South Trøndelag police said that a twelve-year-old child was frightened by someone dressed up like a clown and armed with a baseball bat.
Agder police said it was also a busy evening there.
“Halloween-related reports have been ticking in to police. Mask-clad people who shot with paintballs and threw stones at buses. Setting things on fire and aiming an air gun at police. It is, to put it mildly, not particularly good,” Agder police tweeted.
Meanwhile, one Stavanger woman was left thinking that no good deed goes unpunished. While handing out candy to costumed children, she accidently tossed her car keys into a kid's candy bag. Police said she was hoping to get them again and urged the unlucky recipient to return them. After all, the kid would probably prefer swapping the keys out for candy.
Monday's Halloween celebrations also marked the end of an era in Oslo. The ‘Halloween House' in Nordberg decided that after 14 years of scary fun for neighbourhood kids, Monday would be the last celebration at what is likely the capital's scariest house.
“It simply takes too much time. It has become too big, and it's time to go out on top,” homeowner Kåre Mortensen said.
For 14 years, Mortensen been notorious for the maze he builds every year for Halloween and the elaborate and spooky Halloween decorations outside of his house.
During the evening, many neighbours stopped by to thank him for the many years of fun provided for the kids in the neighbourhood.