I respect Blaiserboy´s opinion, but in my own experience USD/CAD can, most of the times, be highly profitable.
It can be used, i have done it, as a hedge against EUR/USD with very good results, now i understand some members of these forum will say "...what the hell!....", just try, anyway it is a good pair.
Regarding your question, friday was a weird day....
With the USA announcements everyone was expecting the USD to keep loosing ground but it moved against expectations, it favoured me because i had some positions against general expectancies so i am glad i realized what was happening before dropping those positions. It was a weird day...
It is true, USD is a safe heaven currency but when things go bad for USD it lose ground, take a look at the charts.