As a DM I would love it if a player did this. The last time a PC did this they picked up the dagger of a paranoid assassin. They attuned it and from that point on I described events in a paranoia enducing way. For instance when they went to stay at an inn, I would say "He hands you the beer rather carefully, his eyes keep darting to it, he looks a bit nervous and his smile seems forced, he seems to be waiting for you to drink it". This led to false accusations, the PCs being run out of town, accusing the local lord of being in league with a cult, destroyed relationships, destroying other good items that "feel off" etc.
It took the party a long time to realize that these descriptions only happened when that particular PC was having it described to them. It took them a while longer to work out that it was the dagger, as he had not told them about it. Of course, when they tried to take it from him, he stabbed one of them dead, being convinced that they were a doppleganger due to 'hints' I had been dropping for a while. It was great, the player himself actually thought that the item allowed him to see treachery and dopplegangers when nobody else could, so even he bought it wholesale.