They don't take kindly to "bomb jokes" so if you have any, leave them at home. In fact, i wouldn't even use the word "bomb" in a sentence. ie. "Man, flying first class is the bomb" may be translated as "there's a bomb in first class", yeah. soooo..anyway.

Maestra-
As per the weight of the carryon- it depends on the airline. Some of them are EXTREMELY strict with the weight, others as long as the bag is the appropriate size, don't care.

As far as how to cut the plastic ties- no biggie, if you're going to a hotel, ask reception to loan you a pair of scissors- worst case scenerio- melt it off with a lighter (careful though and stinky :p -not ideal so if you can find something to cut it off better!) or if you're staying with someone, well borrow a knife or scissors. Hakuna Matata!

Snoo... as per the chocolate remark- that was because of the turron commment- there are different kinds of turron- some of them being chocolate-its a christmas sweet- just one of the many popular items people like to bring with them- Spains chocolate is not world renowned or anything like that. As for the no Dairy and your Cadbury bars- don't take it so literally! What they don't want is for you to bring in cheese (bacterias it can have), stuff like that. Thankfully chocolate is ALWAYS ok! Myself I usually bring a container of cola-cao! YUMMY!

When I travel, I usually have a bunch of tubes of oil paint in my luggage. It was wild the first time when the scanner saw all the cylinders of paint, she thought they were dynamite sticks! Now I warn them about it, and there is no trouble. If you are an oil painter, like me, remember to empty out and wash out your turps and medium containers. Flamable liquids and their fumes are frowned upon on planes.

In reference to the Power Bars, since they look (and taste) like C-4, they may want you to keep them up top, too!

Cali, the old power bars were most definitely an acquired taste! I've been taking Luna bars with me lately...they remind me more of chocolate covered rice krispie treats! But hey, if there is no food in sight and I have a train to catch, C-4 isn't so bad! It gets your day off with a bang!