I lend and borrow things from friends and neighbors all the time. The only time it has become a problem is when I have moved to another state. A few months after the move I’ll be looking for something figuring that it must still be packed away in a box somewhere. Then… “Argh! That guy Paul has it and conveniently forgot to mention it as we said goodbye for the last time!” Paul still won’t return my emails. I’m squinting my eyes at you Paul… squinting I say!