Pursuant to this Twitter thread:

Xanadu-Shave

In Xanadu A dome decree Where river Alph Runs down to sea Burma-Shave 

This is Xan a du

I have decreed the pleasure-dome that was in Xanadu

where Alph the sacred river probably ran through caverns down to a sunless sea.

Forgive me they were measureless to man and the dome so stately.

Plumb Thief

From box-of-ice did I your friend A hearty batch of plums consume Of which, forgive me, you to eat - Delicious breakfast, cold and sweet - Were saving, I presume.

(Inspired by These Are Just To Say)