Yep, happens a lot. 1 of 2 things.
1. pedal box has broken. there are only a few spot welds that hold it together.
2. 1 of the 2 mild steel studs that come off the pedal box and go throught the firewall to the master cyl have sheared. Happened to mine after a whole day of drifting at winton, it only broke about 20 mins from home changing easily from 2nd to 3rd. driving home rev matching was fun.