Halloween this year could see thousands of children taking to the streets again after years of disruption thanks to Covid lockdown.
And while many will be wearing traditional costumes - and carrying traditional bags and buckets for their sweets - some may be using a special colour code.
While a traditional pumpkin is usually orange for Halloween trick or treating in the UK, you may see some with a different colour for a good reason, reports, Manchester Evening News reports.
Blue pumpkins or buckets being carried by someone trick or treating can indicate that they are autistic.
As well as something you may want to be aware of when meeting an autistic child at your doorstep, it can also explain why older children and adults may be taking part.
The idea was started by a mother in America, she wrote on Facebook: "If you see someone who appears to be an adult dressed up to trick or treat this year carrying this blue bucket, he’s our son!
"His name is BJ & he is autistic. While he has the body of a 21 year old, he loves Halloween.
"Please help us keep his spirit alive & happy. So when you see the blue bucket share a piece of candy. Spread awareness! These precious people are not “too big” to trick or treat."
The idea was picked up by other parents and groups that support people with autism and is becoming increasingly commonplace.
People with autism can find it hard to communicate and interact with other people, and find it hard to understand how others think and feel.
Bright lights and loud noises - including Halloween decorations and 'scares' - can be overwhelming.
They can get anxious in unfamiliar situations.
Teal pumpkins may also be seen due to another campaign which also started in America in 2016.
The Teal Pumpkin Project is an awareness campaign from Food Allergy Research and Education (FARE) which aims to make sure children with food allergies or other dietary restrictions can also enjoy trick or treating.
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