A Google Web Search Help thread has reports of a really annoying Google bug that happens when Opera browser users try to use Google on some machines.
The issue is, Google is auto-submitting the search of the first letter as you type it. For example, if you load up Opera, go to Google and want to search for [flowers], Google will see the f and before you have time to type the l, Google will submit a query for the letter f.
The bug was first reported on Wednesday and a Googler responded to it on the thread on Friday saying:
Thanks for bringing this to our attention. Thanks also to Bluequoll for keeping up on this. I just wanted to let you know that we're currently investigating this issue, and will come back with updates as soon as we have them.
Forum discussion at Google Web Search Help.