My first tank was so tiny that it was impossible to get the siphon started the traditional way, and I didn't want to use my mouth, so I came up with another solution. I used a bulb syringe aka nasal aspirator aka one of these:
Amazon.com: BULB SYRINGE 2 OZ: Health & Personal Care
Available in any H&B department for under $2 (or ask anyone with an infant, for some reason people love to give these as baby shower gifts, and really, how many does one baby need?)
Just squeeze the bulb, stick the tip on the end of the tubing (it doesn't even have to seal perfectly), release the bulb, the water starts flowing, et voila- DIY bulb-activated siphon
(and yes, I have one reserved for fish only!)