The original Budweiser Clydesdale 9/11 commercial aired during the Super Bowl just after the 9/11 terrorist attacks on the US. Budweiser ran it one time only to avoid profiting from the advertisement. The commercial was then pulled and not shown again until an edit was aired in 2011, to mark the 10 year anniversary of the worst terrorist attack in the history of America.
This is probably one of the most touching, heart-tugging commercials ever aired. Those who remember the events of that day, even those, like me, who watched the events through televised sources, will truly appreciate the power and message in this advertisement.