[karatestomp]

I briefly had to use it a couple years ago and found it super confusing. Lots of business tools for me are "places I put things if I want to lose them" and Teams 100% qualified.

Then again I bounced off Facebook in ~2011 because I didn't understand the UI (couldn't figure out where anything "went" or would appear for others when I posted it any of the various ways to post things—wall, others' walls, comments on things, statuses, and so on—or where they were coming from when I saw them) and Twitter's confused the hell out of me since a couple redesigns ago, so possibly I'm just dumb.