Never had a problem with flight crew, but did have a funny incident with a flight attendant.
J/S from Narita to MSP about 7 or 8 years ago. I meet the crew at the gate, do the paperwork with the Captain and he tells me to check in with the F/A's and I'm welcome to sit in the cabin. Usually they give us a seat in Business or First if one is available, but regs only stipulate Coach. Anyway, I'm waiting by the entrance to the aircraft in the jetway before boarding and one of the flight attendants says to come on in, that there is lots of room on the flight and it's ok for me to board before the passengers. So she takes me to a coat closet where the F/A's stick their bags and stuff and tells me to put my bag in there, which I do, then she escorts me to a seat in business class and says I can sit there. So I thank her and settle in. The passengers come aboard. Coach is packed to the gills, business is about half full, and First is nearly empty. I'm dozing in my seat just prior to pushback and I feel this tapping on my shoulder. It is the senior F/A, old enough to be my grandmother's 3rd grade teacher, motioning me to follow her. She leads me to the closet where my bag is and says, "This closet is for OUR bags. You are not allowed to put your bag in here. Get it out!" So I pull my bag out. Then she says "Follow me." She leads me back into the bowels of coach...way in the back, to the only empty seat, in the middle row. So naturally all the overhead storage is full and I have to cram my bag under the seat in front of me (it barely fit) and then wedge myself in to my new "seat". We take off and I am sleeping when I feel another "tap" on my shoulder. It's the captain. He says, "What the heck are you doing back here?!" I tell him the story and he gets this big grin on his face and says to wait just a min or two. About 5 mins later, that same F/A who initially escorted me into business comes back and apologizes and tells me to follow her and up we go to First Class. Me and one other person.
The rest of my flight was absolutely perfect. Turns out the senior F/A was a "pilot hater". She just took it out on me.
Oh well, the main point is to maintain your composure and don't ruin it for the rest of the guys at your airline by making a scene.