Worst one ever for me was the factory installed filter on a 75 trans am with the shaker hood scoop and turkey on the hood.
I used strap tyoe wrench, bent it up. Then used a screw driver, it tore out. Drove a tire tool thru the remains, it tore out too Took off the mount and took to the dealer, they ended up with a big pipe wrench, broke the mount and the remains of the filter still did not come off. They went out on the lot, robbed a mount, made sure the filter was able to be removed and sent the mechanic over to install it. Small town dealer, life was different then.
On R1100 R1150 BMW motorcycles the filter is completely recessed. You must have a tool that fits filter, it is a common pattern, cheap and easy. (The common pattern was eliminated on the R1200, so you HAD to buy a special wrench.) Anyway one poor guy tried to remove his filter by driving a screwdriver thru the filter at an angle. He managed to drive that screwdriver right thru the thin casting of the engine.
I think the hole was welded in place, but still cost a lot for that change.
Rod