But for daredevil Charlie, being locked out poses no problems.
He scales the two-storey wall of his owner's home to get back inside.
His gravity-defying antics have earned him the nickname "Spider Cat".
And the seven-year-old cat has now become something of a local celebrity among neighbours in Denny, near Falkirk.
Owner Hannah Smith said today: "Charlie miaows at the front door to be let out. So we let him out but no sooner is he let out than he wants back in.
"But if no one hears him at the front door, he then wanders round to the back of the buildings to find the balcony.
"He then climbs up the balcony to get in. So Charlie really goes out the front door and in the back door."
Ms Smith added: "I got him as a wee kitten and out of the litter Charlie was the one that looked most mischievous and I liked that about him. He's certainly lived up to his reputation.
"I think it is totally incredible how Charlie is able to climb up a roughcast wall. I've seen cats climb trees but I've never seen a cat climb a wall. It's amazing."