After Google made their announcement to lift their censorship in China, regular Chinese folks from Beijing started arriving at Google.cn HQ, and leaving flowers behind. Apparently, local security guards didn't take too kindly to the act, and that led to an Internet meme and phrase "illegal flower tribute" being censored in China.
Yes, this has now gotten stupid.
"subsequent visitors were arriving only to discover that the flowers donated by previous visitors had been promptly removed by the alleged "security guards", and one security guard from the neighbourhood was reported saying that, in order to deposit flowers people would need to apply for permits at the related departments; otherwise without approved permits, they would be conducting an "illegal flower tribute"."
- Illegal flower tribute - Wikipedia, the free encyclopedia (view on Google Sidewiki)