The 400D uses flash assisted focusing. In low light conditions the auto focus cannot get a focus lock so it pops the flash a few times so the lens has a chance to focus. You will notice this will go away when in the manual focus mode (the switch on the side of the lens).
The only way around this problem (as people in a photo think the photo has already been taken and looks away when the camera actually takes the picture) is to use a hotshoe mounted TTL Canon Speedlight (430ex or 580ex) which use an infra-red focussing beam.
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