You have to know your audience
A few weeks ago I was out at a lake (actually, at a camp on a lake) when somebody mentioned "You know what? We should go fishing."
I said "Capital idea, old bean!" I then proceeded to get out my laptop and started typing:
As part of our regular security screenings, we are requiring you to click on the below link and enter in all of your information...
None of my friends out at the lake found that joke at all funny (they didn't understand my play on the word "phishing"). My co-workers on the spam team, by contrast, found it quite amusing.