Killer robots draw a killer $60.6 million at the box office Workday be damned, "Transformers: Revenge of the Fallen" blew away the existing record for a non-Friday opening Wednesday by selling an estimated $60.6 million worth of tickets in the U.S. and Canada.

Paramount's Michael Bay-directed f/x extravaganza easily exceeded the Wednesday record of $44.2 million set by " Harry Potter and the Order of the Phoenix" in 2007 as well as the biggest ever non-Friday gross of $51.3 million, which " Spider-Man 3" hit on a Saturday in 2007.

The only mark it couldn't topple is the absolute biggest single-day gross; "The Dark Knight" earned $67.2 million on its first Friday last year. Accounting for ticket price inflation, "Transformers' " number is a virtual tie with the No. 2 film on that list, "Spider-Man 3," which took in $59.8 million when it opened on a Friday in 2007.

Such an impressive launch sets up "Revenge of the Fallen" for a potentially huge first weekend. It is now virtually certain to break the five-day record for a film opening on a Wednesday: $152.4 million for "Spider-Man 2" in 2004. If its initial momentum continues, it could even exceed "The Dark Knight's" $203.8 million, the all-time biggest five-day gross.

However, if reactions from moviegoers turn out to be as negative as those of most critics, public enthusiasm could quickly wane and "Transformers" would end up with a far less impressive run at the box office than its first day indicates.

The ultimate performance of "Revenge of the Fallen," which cost just under $200 million to produce, will depend more on its grosses from international markets. The first "Transformers" movie earned 55% of its total box office revenue overseas.

Paramount opened the picture in almost every major foreign country Wednesday after a strong debut in Britain and Japan over the weekend. International grosses were not immediately available Thursday morning.