Switching letters is called spoonerism. For example, saying "jag of Flapan", instead of "flag of Japan".
2
The word 'mortgage' comes from a French law term that means 'death pledge'.
14
A “butt” was a Medieval unit of measure for wine. Technically, a 'buttload' of wine is about 475 liters, or 126 gallons.
10
Anuptaphobia is the fear of staying single.
11
The word "listen" contains the same letters as "silent."
135
The word "impossible" dropped in use by 50% over the course of the 20th century
5