What are some flawless bicep exercises that don't require ANY equipment?

I don't have weights or nothing, and am looking for some bicep exercises that don't require weights, equipment, nil. Thanks.
Answers:
try some press ups xxx
Chinups. Find a tree branch or a lamp post where you can do some.
Chin-ups, pull-ups, push-ups. You can also just find some heavy items, close to a bucket full of stuff or a backpack full of books and curl them.

Related Questions:
Can CRT TVs prejudice close by electronic equipment?   What's the most powerful fitness equipment?   How can you workout your cheast minus equipment?   What equipment do i want to rope my 2 subs parallel?  
  • Does anyone know a fishing equipment intact purveyor?
  • Why do individuals wipe down excercise equipment at the gym?
  • What equipment is carried contained by a soldiers/marines backpack/rhucksack?
  • What equipment do I call for to trade name electronic music?
  • What type of equipment does LA Fitness hold?