Because of the funny picture I saw at a blog and the caption, I decided to ask for more. And here's the results. Will be more effective if you know what happened with Zidane during the France vs Italy match, World Cup 2006.
1. Found at NUS student's blog.
2. Random search result from google.
An opportunistic Chinese entrepreneur actually tried to trademark the silhouette of the headbutting action and sell it. Full article here.
Useless fact of the day: How can I give up a chance to share this term that I came across in the midst of "research"? A Glasgow handshake is the urban slang for giving someone a headbutt. Also known as Glasgow Kiss (John Petrucci has a song by that name if i'm not wrong!), it has enriched my geographical imagination!
