The IEEE organizes a Bogus Conference in Istanbul, Turkey in 2008
We received this by email:
The higher 30% of our Participants will receive a gold certificate, the
40% will receive silver certificate and the other (lower) 30% bronze certificate,
but because you are a prominent scientist, you will receive your gold certificate.
See the web pages of this stupid conference
The funny story with the 30-40-30 % gold-silver-bronze certificates can be found on the link:
You can draw your own conclusion