Camera flash bulbs! I remember having to constantly replace these because you could only take 4 pictures. We've come a long way.
'Old Phone Booth' [Thought to be the last remaining old-fashioned outdoor phone booth in La Crosse, Wisconsin, USA (located in Myrick Park). 2012 post note: This phone booth has been gone for a couple years now.]~[Photo by ~DewCon~ (Doug Connell) August 18 2006 La Crosse, Wisconsin, US]