I live in earthquake country (California) so you get use to them. But not so much in the Northeast.
The Globe and Mail is reporting on its mobile site that there are numerous reports of "unusual ground shaking in various parts of Ontario," as well as Buffalo, N.Y. The Canada earthquake shook Toronto and Ottawa at approximately 1:45 p.m. Eastern Time today, June 23, 2010. The USGS reports the quake had a magnitude of 5.0.
The quake was also felt by some as far away as Boston, Cleveland and Chicago.