https://i.imgur.com/XlNFCOI.jpg i noticed this near the edge of my lot this morning, i didn't see any of my sims build it was just... there i've never seen a sad clown snowman before, i didnt even...
When i saw my first tragic clown snowman it was on the home lot and i found it already complete. I dont think a sim has to be grumpy. Having their needs mostly close to or in the red zone is more likely to result in success. To get my sim to build the snowman in my pic above i had to use testing cheats and drag her needs down. I was scared she'd die but i really wanted that snowman.