The toaster was invented before pre-sliced bread.

Toasting bread has been a common practice since the time of the ancient Romans. However, it was not until 1853 that the first electric toaster was invented by a British firm called Crompton and Co. This original model only toasted one side of the bread at a time and required someone to stand by and watch to make sure the bread didn’t burn. The more contemporary pop-up timer toasters we are used to were not invented until 1919.

Nine years after this revised model and seventy-five after the original British toaster, a man by the name of Otto Frederick Rohwedder came along and came up with the coolest thing since sliced bread...mechanically sliced bread! His first machine incorporated hat pins to hold the sliced loaves together, but this did not work very well and the bread went stale quickly. Finally, in 1928 he finished a machine that sliced the bread and wrapped it in plastic! Pre-sliced bread and the electric toaster were a match made in heaven, and remain a staple of American breakfast food to this day!

Source: About.com