Heard that one before. Still funny.
I think you forgot to set up the part where the convict talks to the wife, though...
Convict whispers in woman's ear... look of horror comes across her face... convict momentarily walks out of the room...
queue husband... and do or don't insert "...and he asked me where the plunger was" into wife's rhetoric, or whatever.
Keep em comin'... these brighten up the day.