Why you shouldn't show off before (or during) a fight.http://www.youtube.com/watch?v=o2VwnBU1-iU
This is a clip from Never Back Down, a theatrical film. But still the point still stands, never know when that'l happen to you.
capoeira is pretty strange... They actually fight exactly like that despite the fact that this was clearly fake. It seems pretty impractical but hey, it looks cool.