Went to a large comic book show probably 10 years ago or so with my GF. Generally go with a bunch of comics we want to get autographed and meet the creators. Standard stuff.
Todd McFarlane is one of the big guests to be there and we manage to get decently close to the front of his line, but before he's actually there. That's OK, we're used to this kind of thing. He's supposed to be there in an hour.
So, we start by taking turns, one person waits on line while the other takes a couple of comics over to another creator, meets them, gets a sig or 3. We generally care about meeting different folks so that's fine. Over an hour goes by, someone comes through the line and said he's not here yet, expect it to be another hour.
OK, so we do some more taking turns getting other sigs. A second hour goes by, and now we're told it'll be a bit longer and they're limiting people to 3 sigs each. OK....
Another half hour goes by, and now we're told it'll be a bit longer, and they're limiting it to 1 sig per person. WTF, but OK.
Another 30 mins goes by, so 3 hrs from when we got in line (don't even know how long it was for the people at the front) and he finally shows up, 2 hrs after he said he would be there and by how they kept cutting down how many books we could each get signed, obviously still planning on staying until he had originally planned to leave (not staying longer to make up for the time he was late).
As we're getting up to the front, dude's not even acknowledging people as they walk up to him. They try to say anything, he says nothing, quickly signs and shoos them away. Until we get there. Because one of us is a girl. He stares my GF down in the creepiest way possible while continuing to ignore the rest of us. She doesn't have much to say to him at that point, so just got the sig and moved on. As we're walking away, he continues to stare her down, ignoring people in line after us.
On the flipside, Jim Lee was the f*****g man. We were in line for him and he was told that his time was up and he had to stop. Everyone was bummed that they waited on line for nothing. He gets up and loudly announces to everyone on line for him that he was told his time's up, so he's sorry he won't be able to really meet everyone else, do any sketches, or take pictures, but if everyone can each take out 2 things they want signed, have them opened to wherever we want him to sign, he's going to quickly walk down the line and sign 2 things for each person so they at least get something for waiting in line. And while he did that, he was chatting with each person who said something to him, at least smiling and saying hi to each person who didn't. He knew fans had waited in line a long time and wanted to thank them for doing so.