Define "a bit"... Since you could say that for example a game is a "bit buggy" while it's swarming with bugs.
Sometimes you have to reload the UI because the game gets stuck when leaving a conversation with an NPC.
Once, when entering water I had major graphical glitches.
Oh, right.. almost forgot. I jumped during a lagspike and I got launched into the air like crazy. I flew a couple miles at high speed and then my game crashed.