He pulled the wool out from under me

This is a classic, perfectly formed malaphor, as it confuses two similar sounding idioms – “pull the wool over his eyes” (to deceive someone) and “pull the rug (out) from under him” (suddently take away help or support from someone).  Both phrases have the word “pull” in them, and both have direction – over and under.  Also adding to the mix is the combination of wool and rug – a wool rug.   A big thanks to the sharp ears of Sam Edelmann, who heard this one and passed it on.