Behold the gorgeous boy of Humanoid City ready to zap you with his strange electricfied antenna ;p But it got us to wonder, where in the world did he get the idea of that vacumn tube mohawk hairstyle? I have a few answers to serve you all for that one question. Here it goes..
A. Tokyo Steampunk Inspired
Yeah, Tokyo has always been famous for their unique fashion and styles, from harujuku to visual kei. Who knows, our Billy here saw some Japanese dude donning that kind of mohawk and it suddenly ticked him or might if I say a lighted lightbulb pops in his head, "Hey, that's an idea for a rocking hair! Why not I do that?" Even if you're a german when you're in Tokyo, you will never be discriminated by your strange style since you can find a lot the local people there carrying a much more weirder look than you. Hence, you're acceptable as you're a part of them too. So, vacumn amplifier tubes for the hair was never a sin and Bill will be an icon for his daring-ness to wear them!
B. Bill's Alien Personality
You know how Bill is really fascinated over these outer space creatures, so don't be mad at me of saying that he wants so badly to be one, a role model of his! Thus, making antennas with those tubes would make him look a lot more like some futuristic alien (I'm not talking about the ugly, creppy and icky ones, it's the robotic human-like kind of alien ) who got lost on Earth and those antenna seems to be a good use for connecting him and his colony up in the space. Beware if that bulbs are lighted, you never know it would hypnotize you and one alien abduction is ready to go. That's it, Bill is one alien to love!
C. Tom's Guitar Amplifier Broke
As Bill admitted himself (see video below), those attractive thing on his head are actually a part of the guitar amps. By just hearing that, it would bring us to only one conclusion and it involves Tom since who else in Tokio Hotel plays the guitar other than his very own twin brother? I'd say, Bill has created a new way of recycling with his brother's broken amps. "If it won't work with the guitar, it could work on something else, maybe on me!" Bet, that's what he answered Tom when Tom was complaining to him about the useless amps. So much of being useless when it turned out to be usable to Bill, after all. Don't underestimate this gorgeous boy, he got lots of unique ideas on his head. So, the next time you have something that couldn't be fixed, Tom, don't throw it away, give it to Bill instead, bet he knows to make it work eventually! ;)
D. Bill is just Bill
This might be the perfect answer among all. Who couldn't deny the fact that Bill is just being Bill wherever he goes? He seeks for attention, he creates his own way of presenting himself and he is everything that nobody could be as he is the one and only Bill Kaulitz!
You don't need to pick A, B, C or D, simply because all of the answers above are right! I know you just have to agree with me on that ;)