Bar fight breaks out and all their friends (80% of the patrons) join in
Bar fight breaks out and someone gets thrown on PCs table, breaking it.
Local craft or merchant guild holds a meeting
The ale tastes horrible - gut check or spit it out
The innkeeper throws another log on the fire, inadvertantly sending a shower of sparks out into the room.
The patron at the next table leans back in his chair too far and falls over.
Three tables over is a know-it-all who won't stop bragging about his accomplishments - in a voice loud enough to hear in the entire place.
Two local merchants or craftsmen overheard conducting a mundane transaction and have a vocal disagreement about it
Waiter flirts with a PC
A shipmate goes harmlessly insane, suddenly spouting random prophecies and thoughts.
Becalmed: no wind.
Boat spotted coming in opposite direction
Cargo is discovered to be different than thought but of equal value and tradeability
Flashing light on the horizon
Ship's boat, one person alive, one dead
Small group of orcs or enemy warriors seen across river
Sun doesn't set
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).
The ship hits a Sargasso Sea...totally becalmed, and weeds choking any possible movement. A number of ships are visible, also stuck, some of them showing signs of being here for years (rotting sails, etc).
Ancient snag filled with tiny holes
Birds of prey circling overhead
Cave or large den
Cloud of insects moves across path
Coyotes fighting over a kill
Field of dead trees
Large tree with face image in bark
Patch of vines strangling a tree
Puddle/nearly dry watering hole
Punctured waterskin or flask on path
All public stat blocks are free for personal use - do not use in commercial products.