You know how ADC/Supp start Gromp/Golem? Steal it.
http://i.gyazo.com/256439ad047870942c800ab3d9254812.gif
If you can get a ward over there without them knowing and they didn't defensively ward properly, you can just sit back and let them hand you level 2. Know they can do the same thing to you, so always make sure they didn't sneak into your jungle and ward the camp you start on! Some junglers will be crippled by this, and if the ADC was going to take it you'll have an even bigger advantage in lane because of their lost health.
People ward against invades often though, so getting out of your base as fast as possible and seeing where they go is important.
