Games prove tempting target for ad ambush

LONDON (Reuters) - What do Danish footballer Nicklas Bendtner's underpants and contact lens worn by British sprinter Linford Christie have in common? They featured in memorable unauthorised marketing stunts at major sports tournaments.

Sponsors channel billions of dollars into events like this month's Olympics in London, but rival companies come up with all manner of wheezes to try to publicise their brand for free in s-called ambush marketing.