Clap often, loudly and proudly. It's a good way of making time go faster in a boring recital. I favor booing and hissing, but I find that pity-clapping or sarcastic clapping is even more devastating for the guy playing.
The first step is learning how to properly clap. You want it to be loud and deep, and you don't want to hurt your hands. Make a cup with one hand and hit over the cup with the extended fingers of the other hand. You can try cupping both hands, but it won't have a sharp sound, and you might look kind of silly.
Know when to clap:
- Clap whenever anyone enters or exits the stage.
- Clap after someone gives a speech or makes an introduction.
- Clap whenever the performer plays a really hard passage, even if you weren't particularly impressed, it will show him your appreciation.
- Clap whenever the performer messes up. You clapping will boost his self-esteem and might help him make a quick recovery.
- Clap if he makes a quick recovery.
- Clap when he finishes a piece. Make sure to keep on clapping loud and proud until you are the only one left clapping, don't stop until you are sure the performer notices you. If you do that enough, the musicians will appreciate it and might invite you for a drink after the concert.
- Make sure to bump it up a notch with a "Wooooo!" or an "Oh, yeah!" when something really cool happens. Make sure to do this in an opera or a ballet when a villain gets thwarted, the singers hit a really high note or a ballerina makes a really impressive pirouette.
- Make sure to sit as near to the front as possible. That way, when you start a standing ovation, everyone else will see you and follow along.
- Sing along if there is a really catchy theme or clap in rhythm to the music.
- Always try to start a wave if you have some friends with you. If someone near you gets up for any reason, try to take advantage of that to start a wave, specially if you're alone. Some music lends itself very well to the wave; wait for some fast scales or arpeggios going up and down and time the wave to the music (for example, Chopin's first etude from op. 10).
By clapping you show your appreciation, which has a huge effect on how the performer does. Don't walk out, clapping is better and will make the recital more fun for everybody.