Favorites from my Mudcat name:

A RASH ON
AH ARSON
AH RAN SO (as in "Ah ran so fast the hounds couldn't catch me...)
OH SARAN (love that clingy plastic wrap!)

...and from my full name:

A BATH SNOB ROT
TART AS HOB NOB
TAN AS BOB ROTH
RAN AT BOB SHOT (and left, no doubt...)
THAT ARSON BOB (no wonder I shot him!)
HART SAT ON BOB (ouch!)
TRASH NATO BOB
...and many more!