A cabinet or wardrobe, if opened, releases a swarm of mosquitoes. Players have a 50% chance of being bitten as long as they remain in the room.
If bitten, they are itchy and uncomfortable, resulting in these players being automatically surprised or flat-footed when attacked (attackers get a surprise attack round before players may attack or react).
Additionally, players suffer -1 on all attacks and -2 on saving throws for the next 8 hours.
rectangular brown wooden table with chairs by Toa Heftiba. Unsplash License.