Thieving

Thieving is a skill that allows players to obtain coins and items by stealing from NPCs and chests.

Pickpocketing
This is the act of walking up to an NPC and right-clicking them, then selecting Pickpocket. In the case of a Master Farmer, only a single left click is required to attempt to pick their pockets. If successful, you will gain Thieving experience and possibly coins or various items. The higher the thieving level, the more NPCs the player is able to pickpocket from.

However, it is possible for the NPC to notice a pickpocket, in which case the NPC will yell "What do you think you're doing?", or a Master Farmer will say "Cor blimey, mate! What are ye doing in me pockets?" and will stun you for a few seconds and cause miniscule damage.

Thievable non-player characters
The Rogue's Den is the location where all thievable NPC's and wall safe's reside. To access this location, talk to the Artisan. To train players will be pickpocketing NPC's or cracking static wall safe's (no stethoscope needed).