There is indeed a poem called "I can't find my invisibility cloak" as well as "I can't find my camoflarge net"

OK, 5 more (last Time!)

The Lost Elephants of Denbigh
Send In The Cones
Je Ne Sais Quoi
My husband has no porridge in him
The Ballad of Cosmo McGrew

Timing, intonation, innocence? and a sprinkling of good old SoH.
Of course Les' material won't appeal to everyone. For them as does, enjoy!