There's an entire subreddit dedicated to these things.
Definitely worth a check.
https://www.reddit.com/r/WordAvalanches/
EDIT: Adding some good examples:
https://www.reddit.com/r/WordAvalanches/comments/3ogese/a_sw...
https://www.reddit.com/r/WordAvalanches/comments/6so5w4/the_...