Hal Jordan tends to get criticized (or laughed at) a lot for being a rather clumsy Green Lantern, what with the number of times Hal's been smacked in the head or has run into things. Granted, most of the other Lanterns don't seem to be nearly as clumsy. John Stewart certainly isn't clumsy. Neither is Guy Gardner, really.
However, Kyle Rayner has been known to have his moments. Case in point:
This is about the time Green Arrow decided Kyle wasn't such a bad guy after all. Yep, Ollie was probably thinking, "Awwwwwww ... Kyle's so STUPID and CLUMSY ... That's the way a Green Lantern SHOULD be!"