I haven't loaned anyone a bicycle in a few years. Hopefully there will come a time where I run into someone with a like minded enthusiasm for cycling that needs to borrow a bicycle for a ride.
"Projects": Incomplete bicycles and parts in the shed. I try not to have too many project bikes, and honestly one project bike is one too many. A shed full of project bikes is like having a driveway full of non-running vehicles. It could become one of those "You might be a redneck if..." scenarios. However, having an abundance of extra parts means less trips to the bike shop when something breaks down and can be an inexpensive or free way of doing maintenance on bicycles.