When using the search bar, typing 'g', 'b', 'y' or a couple of other "keywords" changes the search engine being used for that search.
You should have the option to disable this. Just a simple switch to disable this would be great.
While it can be useful, it can also be incredibly annoying.
I have searched things like "B Good", and specific usernames that start with one of the letters, and have been left frustrated when it shows results for "Good" on Bing.