For Sydney radiation therapist Mark Udovitch, a good sense of humour is essential.
The 28 year old works at Liverpool and Macarthur Cancer Therapy Centres and each day he meets people at "the lowest point in their life" and helps them through their cancer treatment.
"I would say a sense of humour is really vital to do my job - we try and keep patients comfortable by having banter with them and we have laughs with them when we can," he tells SBS.
More than two years ago he started growing his hair long so that he could donate the locks to be made into a wig to help cancer patients who lose their own hair as part of their chemotherapy treatment - and the big chop is set to happen on July 29 as part of his Dry July Shave Off fundraiser.
But when his mates started teasing him about his luxurious head of hair and comparing him to Creed frontman Scott Stapp, he decided to take on some other celebrity impersonations in the hope of raising more money for cancer patients.
"I thought, I wonder how many celebrities I could actually impersonate in the lead up to shaving my head and maybe use it as a means of raising awareness," Udovitch says.
Conchita Wurst, Fabio, Janet Jackson, Johnny Depp, Kendall Jenner, and Princess Leia are just some of the famous people he has posed as.
His favourite so far has been replicating the already infamous Kim Kardashian champagne photo.
"We had to actually think about, how do we get this giant foam explosion happening, and I started googling and then we figured out that Diet Coke and Mentos were pretty good, so we jammed a whole lot of Mentos into this Diet Coke and then it exploded everywhere," Udovitch explains.
The celebrity impersonations have given many of the cancer patients he works with a giggle too.
"We've got some posters up on our wall, and they have a laugh about it," he says. "The response from patients has been quite positive."
While the photos have been "so much fun", Udovitch has grown quite attached to his long locks and has mixed feelings about losing them all soon.
"It's very much a part of my life now," he says.
"This is the first time I've been on trend for anything in my whole life, so I'm sad to see it go but at least it's going somewhere nice."
Udovitch and his colleagues had set a goal of raising $100,000 as part of their Dry July Shave Off. So far they have raised just over $20,000, and they will continue accepting donations until the end of August.
And just because Udovitch is losing his hair, that doesn't mean an end to the celebrity impersonations. On the contrary, he will soon have bald celebrities in his sights.
"You might see a Bruce Willis, Sinead O'Connor, that type of thing," he says with a laugh.