Knocking on the door to get access to the roof? Getting a ladder? That is for the weak. Harrisen Howes found a more complicated but entertaining way to rescue his small drone, which his friend accidentally crash-landed on his neighbour's roof, by using a larger drone and coat hangers.
And luckily he documented (and added the proper background music to) the entire operation:
Two Months ago my roommate drunkenly lost my small drone on a neighbours roof. Two months later after upgrading to a larger drone I attempted a rescue of the smaller drone using hooks I made from coat hangers.
Also would like to add that access to the roof wasn't possible which lead me to this haha.
MacGyver would be proud.