The Frightgeist: Harley Quinn and Trump favourites for fancy dress
It could get very scary indeed. The weekend will be populated with DC comic book heros, Donald Trump, Snapchat filters and sugar- skulled zombies lurking around bars and streets corners.
Perennial Halloween favourites like witches, zombies and ghosts have been outflanked in terms of popularity by 'Suicide Squad's Harley Quinn.
It is the most-searched-for costume on Google, and Irish make-up artists have been inundated with requests to recreate the pink and blue pigtailed look.
"Harley Quinn will be everywhere this weekend," Donna Morris Conlan from Make-Up For Ever said.
The DC comic book character's costume is so popular it's been dubbed the 'pumpkin spiced latte' of 2016 Halloween costumes.
"It's a great look but you have to put a twist on it or else you'll end up looking like everyone else," Conlan said.
Snapchat filters are another favourite - so expect to see lots of panting puppies and vomiting rainbows.
According to Conlan, Snapchat-inspired costumes are popular as they are so easy to master.
"If you get the make-up right - then you don't have to focus as much on the outfit," she said.
We are in the final furlong of the US presidential election so expect lots of bad tan, pant suits and The Donald's trademark pursed pout at parties.
They may be banned from some pubs and parties, but killer and creepy clowns are the fourth most-searched-for Halloween costume in Ireland.
You can also expect to see a handful of Pokemon Go rarities such as Pikachu and Charizard out trick or treating.
Mexican 'Day of the Dead'-style sugar skulls, covered in tiny love hearts and swirling floral motifs, are also popular.
"The ornate make-up looks really dramatic and is more colourful than your typical skeleton costume," said Conlan.
Fancy dress stores have noticed an increase in the number of gents hunting for 'Game of Thrones'-inspired costumes or garish Joker ensembles. Magical and mythical creatures like unicorns, fairies and mermaids have also jumped up in the popularity stakes.
And of course there will be the more familiar costumes - Draculas, emojis, ghosts, Frankenstein's monsters and a healthy number of Father Ted Crillys and Mrs Doyles heading out this evening.