Amanda Johnstone, of Dumfries said the scorpion was about 3 inches long, The Sun reported Sunday.
The scorpion got knocked to the floor and started making its way toward Johnstone's 6-year-old son Ross and her elderly mother Gloria, who leaped out of its way.
"Ross started shouting, 'Scorpion, scorpion!' I saw it and I was like, 'Oh my god, this is a bloody scorpion'. Mum's just had her knees replaced. I've never seen her move so fast -- the op definitely worked. I was absolutely terrified. I thought they were all poisonous," Johnstone said.
In the end, Johnstone's nephew Aaron, 29, captured the creature in a pint glass and an animal rescue officer came and picked it up.
The creature was later identified as a North American desert hairy scorpion, which is non-lethal.
"Desert hairy scorpions aren't deadly but if bitten the pain can vary from that of a bee-sting to intense inflammation and sickness," said animal rescue officer Tricia Smith.