2 opposite ends of the spectrum:-
1) Mike Tyson - No socks, no robe, no music; neck twitching; just chilling!
2) Chris Eubank -v- Henry Wharton (I think it was that fight, but I'm not 100%) - Coming to the ring on a Harley Davidson motorbike.
Honourable mention to George Foreman -v- Muhammad Ali, when he jogged to the ring as if he was so desperate to destroy Ali & get back to the USA. Of course, it never worked out that way for him.