In the episode Sarek, ambassador Sarek (and his wife and aides) come aboard the Enterprise, which is to host a Federation-joining conference with some aliens. Geordie and Wesley install a pool for the aliens, who are presumably aquatic (amusingly, Sarek reports they are offended by furniture). I say aquatic, but the pool is filled with some weird gloopy fluid rather than water. Wesley says it stinks, but Geordie can't smell it (not unusual, there are several terrestrial smells and tastes, such as coriander, that are perceived differently between people according to genetics).
Anyway, during the episode crewmembers of the Enterprise are subject to sporadic moods of violence. Picard, following hints from Sarek's meddling aides, concludes Sarek, in his old age, is leaking repressed Vulcan emotions across the ship. Is the diagnosis ever confirmed? Dr Crusher suggests a medical test, but doesn't do it!
I have a different theory. Observe that every fight happens in either Wesley or Geordie's presence
- Wesley and Geordie fight at the pool (over girls). This is the first fight.
- Beverly slaps her son Wesley
- The bar brawl (Geordie is drinking on the adjacent table)
- Picard and Riker argue on the bridge (Wesley is just below them at his desk)
Perhaps the alien fluid induces violence in humans. It is volatile, so could saturate to Wesley and Geordie's clothes, and so be carried around the ship. What do you think?