I like pub gigs as it's the best time the band spends together. We are well rehearsed but rarely play the same song in the same way twice, it is the creation of music in front of an audience that does it for me.
For example, last Saturday our guitarist called out 'Rock Me Baby' but Jenny (singer) said she didn't want to do it, so we played it very slow and a little funky, she was getting into all sorts of vocal tricks with it and the audience were captivated by the effect of such as well known song being torn apart and rebuilt in front of them. It helps that we have a very good vocalist, of course.