Shit Case 1: sometimes you do a search, find a new phrase and begin typing it only to see the phrase disappear from the original search results and replaced with updated results for an incomplete and often incoherent query.
Shit Case 2: often I begin typing a new search query and realize mid "sentence" that the current query was fine. Well, too late. Because the results have already refreshed. Hitting the back key does little good. In best case, it doesn't work. In worst case, it will take you to the previous physical page that you were on before you came to google.
I find some of these changes mind boggling and can only convince myself to accept them by tell myself "hey google looks at the numbers, may be most folks just like it". Particularly the ajax search...annoys the crap out of me and finds way to enable itself even when I disable it.