Paul Dano has offered a disclaimer to fans wanting to imitate his “homegrown” Riddler costume, which he donned for The Batman.

The actor revealed that his attempt to form the character’s creepy appearance had resulted in his brain “getting very tight” after just one day of filming.

Explaining his choice of costume on The Tonight Show with Jimmy Fallon, Dano said he wanted to make sure to live-up to his character’s “meticulous” nature.

He said: “It’s more of a homegrown costume. I wanted the details covered, he’s very meticulous… so I had to cover myself in cling-wrap.

“I wrapped myself in cling wrap which I thought looked scary because of the light and I thought I’m not going to shed any hairs here on the crime scene.

“The first day of filming about an hour in and I just start to see white, and colours, and my brain is getting very tight… and it’s day one so you don’t want to be the actor who’s like ‘I’ve got a little headache’.

“You suck it up (but) you can’t sweat that’s the issue, it goes back inside you.

He continued: “I got through day one without telling anyone and I got home and I’m probably Googling ‘brain swelling’ in my bed.

“The next day we started to poke some holes in the cling-wrap, my head could breathe, things got a little better.

Addressing the audience directly, he said: “I might as well take this opportunity to offer a disclaimer to any Halloween costumers, or cosplayers out there: maybe skip the cling-wrap.”

Dano attended the star-studded premiere of The Batman in London last week, alongside his castmates.

The Batman will be released in UK cinemas on Friday, March 4, 2022.