Clyde Primary School teacher Sydney Robertson has a Christmas elf whose behaviour has got a bit out of control leading up to Christmas.

Deirdre has been playing pranks on the students since the start of December, firstly ruining all of the Year 6 and 7 art work, and then giving the teacher a crazy hairdo.

But the final straw was last Friday when she stole the keys to Sydney’s car and crashed into a pole right outside school.

“She’s a bit of a menace,” Sydney said.

The antics started on December 1 when the class was making candy cane art and Deirdre came along and drew all over it.

“And then I thought I would get a bit more drastic. A bit more out the gate,” Sydney said.

She hunted all over social media for ideas, but felt many of them were a bit lame. She wanted to create more of a ‘wow’ factor, so one day turned up at school with an interesting haircut.

Sydney Robertson showing off her new hairdo thanks to Deirdre the elf. Photo supplied

“I told them Deirdre wanted to open a salon so she gave me a haircut and some bangs.”

She said the Clyde School staff were more pranked by it than the students.

Then last Friday things really started to ramp up for the last full day of the year.

Sydney got to school early and made it look like she had crashed her car into a pole. She sat Deirdre on the dashboard with a note - “whoops wasn’t me. I’m outta here.”

The principal arrived at school and instantly fell for the joke, asking Sydney if she was alright.

“But I said, ‘it wasn’t me it was Deirdre.’”

The Clyde School principal and this Central App reporter both fell for the prank. Photo supplied

Sydney made it even more convincing by adding ‘caution’ tape which she found in a drawer in her classroom, and put a ‘no elf parking’ sign and ‘elves rule’ sign in the back window.

“I just wanted to set up a deck chair outside and watch all of the reactions.”

She said people were coming to the school all day to take photos, once word got around about Deirdre’s crazy antics.

Sydney said her elf has been around for awhile, but this year her behaviour was increasingly naughty, and finally they’ve managed to put a stop to it.

“She’s in elf jail now.”