Two days then he'll have his vacation
just a time of great consternation,
like two ships in the night
one be high as a kite
and out cold in the operation.

If they change the date yet once again,
I shall count to the numero ten
then I'll flaunt my plum'age
and perform a lavage
on the surgeon's own cranium, right then!

Herbert Nehrlich

http://www.poemhunter.com/poem/another-limerick-for-jerry-h/