My current campaign started with the WotC free adventure A Dark and Stormy Knight.
In that adventure, the PCs are all travelling across country when the weather takes a turn for the worst, and each heads for the only available shelter.
Worked out quite well, because the two characters we had were (developed in isolation) a druid-hating pixie and a fey-hating druid. It was hard to see them spending any time together voluntarily, so a potentially lethal hailstorm came in very handy.
Paizo Module U2 Hangman's Noose has all the characters drugged by someone with a grudge, to wake up locked in a haunted courthouse with a bunch of strangers. Not an approach that works for all groups, of course.
In that adventure, the PCs are all travelling across country when the weather takes a turn for the worst, and each heads for the only available shelter.
Worked out quite well, because the two characters we had were (developed in isolation) a druid-hating pixie and a fey-hating druid. It was hard to see them spending any time together voluntarily, so a potentially lethal hailstorm came in very handy.
Paizo Module U2 Hangman's Noose has all the characters drugged by someone with a grudge, to wake up locked in a haunted courthouse with a bunch of strangers. Not an approach that works for all groups, of course.