A previous owner removed the gate from our back garden and trained hawthorn bushes over the gap.
I kept it like that for years to deter trespassers, since I didn't need access to the rear. That changed when my elderly mother moved in and I needed wheelchair access.
The OT told us we couldn't have a ramp at the front, so the back it was. As soon as I had a back gate installed, I'd get tradesmen, etc using our garden as a shortcut. (Our house is at the end of a terrace.) I also started finding dog mess in the back garden.
When Mum died, I padlocked the gate.
My husband was very disabled following a stroke and I was at work the day the neighbour's middle-aged son decided to climb over our gate (presumably to retrieve a football).
DH had a cataract, macular degeneration and stroke neglect in one eye and the back garden is quite big. So far as he was concerned, a strange man was trying to enter our property. (Our living room has a large window that looks into the back garden.)
DH opened the window and roared at the intruder to get to...
Shortly thereafter, the neighbour's son pounded on our front door and berated my husband for daring to swear at him when their were children around. (Presumably his kids visiting granny?)
He then proceeded to mock my husband's infirmity. DH kept his head and said "Oh, it's you. So where are you working these days?"
"What's that got to do with anything?" replied the neighbour's son and left.
I had a look at the gate and concluded that the problem was that there was a nice flat surface for anyone strong enough to hang onto and then to balance on before jumping off.
I found some scrap wood, used my multi-tool and cut the wood into little pyramid shapes which I screwed onto the top of the gate in intervals tight enough to stop a grown man from being able to place his feet between them. (I wasn't strong enough to hammer in nails.)
I then painted the gate and pyramids with some paint that DH had left in the garage. Looked rather lovely, I thought.
After DH died, I was in the house on my own when I saw someone trying to climb the gate by balancing on top of the pyramids on top. I yelled, startling the intruder.
He flailed about, grabbed a dead hawthorn bush and landed on his arse as the bush snapped.
I turned out that it was the neighbour's other middle-aged son, looking for a football. The funny thing is that I'd forgotten to lock the gate that day.
Presumably, I should have discussed it all with the neighbour in case her idiot middle-aged sons hurt themselves.