[borlak]

What do you mean? The SWF progress bars are one of the few that can actually be relied upon. A good example: http://armorgames.com/play/12141/kingdom-rush

The Microsoft installation progress bars are the ones I remember as being ridiculous. Often going backwards, showing ridiculous install times, etc.

[mcintyre1994]

I think the worst was Windows movie maker, which used to seem to just randomly choose a time it might take and do a bad job of self correcting on the way. Oh, and of course there's a relevant xkcd, http://xkcd.com/612/