I wanted a challenge embark, so I chose a 2x2 site that's a mix of terrifying tropical jungle and untamed tropical swamp. With an aquifer. My dwarves had been digging and chopping trees for all of 30 seconds when a herd of skeletal elephants wandered onto the map. You can imagine the mad scramble to get a few supplies underground, throw together a quick carpenter's shop, and then wall off the surface world with logs. Luckily the elephants seem content to slowly circle the map, checking out all the murky ponds around the edges.
Taking stock down below, my seven dwarves have managed to retrieve 4 full barrels of booze, 7 nearly-empty barrels of meat, 3 logs, and 3 bags of seed. So obviously I make a bucket, channel out the aquifer beneath their feet, and get a farm going. Then figure out what to make with the other logs - two beds, or a chair and a table? My dwarves could be in for a long wait here...
Edit: Spoke too soon. Left a wooden door in the wall, and the skeletal elephants came straight through it. Could be my shortest embark ever
Edit^2: Yup, that ended in a good old-fashioned stomping. I thought I had a chance when only a single elephant came down the ramp, especially when he charged a dwarf, missed, and fell down an irrigation pit and into my farm. Sadly my civilians freaked out and ran for the surface... where the other four elephants were milling around. So I save-scummed and tried again. This time I managed to get nine logs
and my anvil below before walling everything off from those same five skeletal elephants. Revenge shall be mine!