A Saturday post

Wow... This is my first ever post from my laptop, and may be the first on a Saturday too. I'm at my folks' place, hooked up to their Internet (Schweeeet!) so that I can download Adobe Reader, so I figured I'd write up a quick post, especially seeing I have not been very good at the post-everyday thing for the past while.

Ruby commented on my last post that every profession 'has its thing'. By this, I guess that she means that there are jokes asbout every job. For example...

An airliner was having engine trouble, and the pilot instructed the cabin crew to have the passengers take their seats and get prepared for an emergency landing.
A few minutes later, the pilot asked the flight attendants if everyone was buckled in and ready.
"All set back here, Captain," came the reply, "except one lawyer who is still going around passing out business cards."

AND

A door-to-door vacuum cleaner salesman manages to bull his way into a woman's home in a rural area.
"This machine is the best ever" he exclaims, whilst pouring a bag of dirt over the lounge floor.
The woman says she's really worried it may not all come off, so the salesman says, "If this machine doesn't remove all the dust completely, I'll lick it off myself."
"Do you want ketchup on it?" she says, "we're not connected for electricity yet!"

What's your profession and what's your best work-joke?