I just got my copy today, I ran into a particularly dumb clerk at Gamestop as well. The conversation went like so:
"Could I get a copy of Boom Blox?"
"I don't think that's out yet." (This was my first hint that she was dumb)
"It came out Monday."
"Oh, let me check." (She spends about 3 minutes fiddling through the wrong drawer, my second hint)
After she spent that three minutes going through the 360 game drawer she says:
"I tend to not keep track of kid's games."
"It's not exactly exclusively for kids."
"Well, ya know, I've been gaming for so long that I need a lot of violence and stuff in video games to keep me busy." (Hint number three.)
(Another clerk says) "Oh, that's the Steven Spielberg game."
(the dumb clerk replies) "That makes me hate this game even more!" (This drew the line)
(So I responded to her comment) "Remind me to kill you."
At that point she shut her mouth. My mother was mad at me for saying that, but I was quite content.