Mover to Last Commit
git reset --hard HEAD
Wicked Wolf
git reset --hard HEADgit checkout 1258f0d0aae #detach from master
git branch -f master HEAD #exactly as above
#optionally reattach to master
git checkout master
git checkout existingbranch
git merge master
git checkout master
git reset --hard HEAD~3 # Go back 3 commits. You *will* lose uncommitted work.
git checkout existingbranch