@Roberta,
Those are great .
Ive got one that is somehwat less obvious but, it made me smile.
Its from one of my san engineers who wrote a report about designing a sewage system for our mining town in ARgentina
"When community , on-ground sewage systems fail, the results can only be described as Cataclysmic"
Now I cant recall the last time I saw a **** volcano.