Just a couple of short ones here. Genuinely witnessed by myself (for the first one) and my sister (for the second).
1. Looking through a catalogue I saw a cooker with a metal plate on the front bearing the words "Caution! This surface may be hot". Written underneath in raised metal braille was the same message. I wonder how many braille dots the reader would have got through before they burnt their fingers?
2. My sister went to a museum and saw a wonderful tactile map. It had, however, been covered by a dust sheet "to protect from vandalism"... which would render the map completely unreadable to its target audience.