[@Seed]I'm very familiar with it. Where I come from they're called Word Traps. I have an entire character based around it. However a lot of times, it can be misused and grossly exploited. So now lets say this copper smell is in fact some prep for a super bomb you have coming later, and Bam you kill us all. But what if my character would have logically been able to detect and understand what it was if the character had an ability in this scope? It would totally void entire parts of some peoples sheets in some cases, especially provided you only give cursory glances at other sheets. I'm not trying to argue, but just expressing a genuine concern.