In the book I am reading it is written :
pun titles such as I Am a Wall Ruse (1969), Skull Daze (1971) and Lolli Pup (1973)...
I can understand the puns of the second an third titles (Skull Daze can be read as school days and Lolli Pup can be read as lollipop) but am not sure about that of the first one. Is it about the "wall ruse" that can be read as "Walrus"?
org/wiki/I_Am_the_Walrus
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Yes, it is a pun on "I am the walrus", a song by the Beatles: