Sentence:  ... For I hadn't had so much fun since the day / my brother's dog Rover / got run over. / (Rover was killed by a Pontiac. And it was done with such grace and artistry that the witnesses awarded the driver both ears and the tail – but I <WSD>digress</WSD>.) 
Meaning of the word marked with <WSD> tags:  To step or turn aside; to deviate; to swerve; especially, to turn aside from the main subject of attention, or course of argument, in writing or speaking.