Never turn the toaster to 8
We have had one of these newfangled toasters for some time. It has an electronic guide as to the intensity of toasting. Normally we use between 3 and 5. 5 gives a quite uniform level of toasting. 7, however, sets the bread on fire. We found this out this morning when a guest decided to toast some bread at level 7. The kitchen rapidly filled with smoke (although the newly rebatteried smoke alarm ignored this - it obviously has a burning bread ignoring function).
Clearly if level 7 sets the bread on fire we should avoid ever going as high as 8 because we could see domestic meltdown.
It is a bit odd that there is a setting for burning bread on the toaster. However, there are lots of odd things in this world (eg our current Public Family Law system).