The orange-haired figure has been causing quite a stir after roaming the city, sometimes by bicycle and talking in a "creepy" voice.
Only in Portsmouth would there be a man dressed as a clown stroking random people on the street🎈 pic.twitter.com/NacxrdchUh— Cat Smitham (@CatrionaSmitham) October 15, 2014
Oh, and he also appears to have a penchant for scaring the staff in clothes shops and one woman claims she was chased down the street by him.
But those hoping for some Halloween-inspired horror twist are in for some disappointment - apparently it's no more than the shenanigans of a 15-year-old schoolboy.
Andrea Hutchinson, manger of Preloved Portsmouth, a store frequented by the clown, said: "He comes in once or twice a week.
"He just likes to come in and stand there doing his tricks.
"He also goes around the pubs doing magic tricks and he has a wallet which he sets on fire.
"He is harmless. I can understand people being frightened though. But he’s just a kid."
Tell that to these people.
Why is there seriously a clown going round portsmouth ffs 😳😳😳😳😳— Robyn Kattenhorn (@robynkatt) October 21, 2014
Apparently there's a random clown scaring people in Portsmouth, I am not leaving my house ever.— Emily (@EmilyJanePower) October 21, 2014
Come to Portsmouth where men in suits and clown masks silently roam the streets— immy (@marnixo_) October 20, 2014
Omg there is someone in Portsmouth with a clown mask running around scaring people. oh help me, I hope i never see him!!— Meg ✌ (@MeggggSheeran) October 20, 2014
Portsmouth locals are nuts, just seen a man riding a bicycle in a suit and a clown mask....?— Lily (@x_lilys) October 17, 2014
People of Portsmouth beware of the kid dressed in a suit wearing a clown mask and holding a balloon!— Nicole Lipizzi (@Nicole_Lip) October 16, 2014
But at least they're not American...