I recently changed the wheels on my Hillbrick (back to the originals as it happens) ... and hadn't used her since.
When carrying the bike on the bike carrier on my car, I use an old toe strap to stop the front wheel from flapping about.
I drove part way to work today. When I loosened that strap, the front wheel fell out the frame
It appears that when I put the front wheel in, I only did the nuts up finger tight and forget to assault them with a spanner
Good thing I use that strap.
The sad part is, maybe them danged 'lawyer lips' actually do serve a useful purpose. The Hillbrick is a custom frame with Italian forks, she didn't come with them.