A couple at another table get into a heated domestic argument - it ends when one of them storms out, the other hastily paying the bill and hustling after their departed love.
A large group enters the establishment, filling up the remaining tables. They are celebrating something, and are quite noisy about it.
A local noble walks in and pays for everyones round of drinks.
A PC finds an unnatural bug in their food.
Bar fight breaks out and someone casts an area effect spell.
Drunken blacksmith passed out in his table.
Food Fight! A wizard with a sense of humor animates the food wich begins to attack everyone present.
This tavern is a clandestine meeting place for a secret society. Their meeting is tonight, in a reserved room or alcove.
Traveler has interesting, but mundane news from outside town
Two local merchants or craftsmen overheard conducting a mundane transaction
A box overthrown from being transported by another ship floats past
Abandoned fishing rod left on lake bed.
An experimental submarine
Children run along the river shore waving at the crew
Filled coffin floating on the water.
Navigation charts and equipment are lost causing the crew to navigate by more primitive methods
Sick Whale thrashing on the surface.
The party member who doesn't wear armor doesn't duck fast enough when the mast boom swings and gets swept overboard (reflex save means they're hanging out over the water) - the crew has some fun at the person's expense (unless they're drowning, in which case the man overboard drill would go into effect).
Dead, rotted, burnt, headless troll body
Disabled wagon with nearby dead campfire
Old ring sticks out of the dirt
Ray of sun light hits tree or bush
Sentry animal (probably bird or rodent) raises alarm
Unusual patch of very lush growth
Wind kicks up
All public stat blocks are free for personal use - do not use in commercial products.