Additional info for non-chair Event Control objects
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For items such as chairs, the Sim can "idle" while stuck in the chair and is therefore responsive to various commands from the player.  On other items, such as the computer or guitar, the Sim is completely occupied and may not be interrupted to to anything else until the session is over.  This can cause a problem if you have all your selectable (resident) sims using a non-interruptible object and you have forgotten to enable automated sessions.  In theory then the Sims will go on using the object for eternity, even past when they would have died of starvation.

I have therefore included a safety valve in this sort of uninteruptible object, which means that once any resident (selectable) sim has used the item for approximately 3 hours, if he has the diamond over him he will be able to stop using the object so you can regain control of him.

Failing this, a "move_objects on" and delete the object will also do the trick (-: