At 8:30 precisely, the frogs beyond the hills scream. I didn't mean to make this so ominous. I meant literally at 8:30 every day from spring to autumn, frogs in the woods over yonder hills will yell in unison. Usually for about 20 to 30 minutes.
Madness string 82345
It's related to body size, but the effect isn't so drastic that different dwarves are either dead or not drunk. I do fear for gnomes somewhat. Perhaps that's just the course of their lives.