Well, it's what we did in KAC and, if you can do it in KWI, you can do it anywhere.

This happens more often in airlines across the world than you would expect. Most of the time though the chute will drop out onto the steps and not deploy - it needs to drop a certain distance to disengage the inflation pin.

Cabin crew are human - no system is protected against human error!!

BA268 now landed safely at LHR. 4 hours behind schedule. I believe the door sensor was faulty after the removal of the slide and a new one had to be replaced. Non event really, nothing to see, move on.

Shouldn't happen on A380 as an extra safety warning in the form of a warning light at door if handle is lifted without disarming !

Or, like on Air China's (CAAC) old Tu154, leave it to the passenger to deploy the slide. I had the "lucky seat" on one domestic flight, fortunately didn't have reason to act.
Fortunately since I have seen clearer instructions included with cheap Chinese gadgets.