I don't like to take out my wallet, because I am scared to lose it, it's too big, it's annoying to carry around... I have always thought of making photocopies of my driving licence, and other cards... and show them when needed... I wonder if that would be valid ?
Anyways sometimes I don't have a choice, I have to take my wallet. For example when I travel. I was at Montreal, and went to the library since it was just in front of the place I had to take the Bus back to Ontario. In that library there was a little nice store selling... Tintin cards... Of coure the temptation was too big so I bought a few Tintin stuff... and I left. I was checking my emails later on, when I got an email from my uncle telling me that I had lost my wallet at X store at Y place.
No need to say that my brain managed right away to realize that I had forgotten my wallpaper in that store I bought the Tintin stuff.  I went right away downstairs and got it from the lady. She was surprised that I was there to get back my wallet...and then I explained her the story... and she explained me hers... she looked in my wallet and looked my name on the net, called the first person she found with the same last name. And it was my uncle. My uncle sent me an email and everything was solved
She did not know I was coming... she had already planned to post it...she had wrapped it around a paper printed from www.411.ca (where she found my uncle's address)

When I got back my wallet, she said it "is going to be such a nice day" ... And happy I walked away...