[dfkf]

If you happen to use cyrillic in your source code (for comments or even strings) and constantly switch between latin and cyrillic, then this actually happens with а "c" letter, because both latin and cyrillic "c" occupy the same button. And that's not fun, btw.

[pavel_lishin]

Depends on which keyboard layout you use, of course.

Russian is my first language, but English is my primary language, and I never had my chance to practice typing using the standard Russian keyboard layout, so I almost always use the "Phonetic" layout - where the latin c is the cyrillic ц. (Also, w is ш, and who the hell remembers what []\-= map to - always trial and error for me to find южэьъ.)