I still have yet to work out why surrealism is funny, but it seems to have been more popular more recently with the like of The Mighty Boosh and Vic and Bob, who are still presenting Shooting Stars.
All I can think is that is presents the unexpected, and from giving you an unexpected situation or phrase, derives humour. We can see ties with normality, but it is seen through a prism, a slightly distorted view of every day life.
Surrealism is extremely difficult to perfect, one cannot make a statement and it be funny. It takes practice. There is a fine line between surrealist comedy and just being weird or trying too hard.