Browns are league leaders in one stat:

[Toxicadam]

Concussions

http://deadspin.com/5667912/the-year-in-nfl-concussions-so-far-a-horrifying-video-compilation?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed:+deadspin/full+(Deadspin)&utm_content=My+Yahoo


2010 NFL Concussions
Training camp: Aaron Curry (Seahawks), Louis Murphy (Raiders), Scott Sicko (Cowboys)

Preseason: Ryan Grant (Packers), Hunter Hillenmeyer (Bears), Joseph Addai (Colts), Mark Clayton (Ravens), Nick Sorensen (Browns), Mike Furrey (Redskins), DJ Ware (Giants), Darnell Bing (Texans), Freddy Keiaho (Jaguars)

Week 1: Kevin Kolb (Eagles)*, Stewart Bradley (Eagles)* Kevin Boss (Giants)*, Matt Moore (Panthers), Charly Martin (Panthers)

Pre-Week 2: Clifton Ryan (Rams)

Week 2: Jason Witten (Cowboys), Randall Gay (Saints), Craig Dahl (Rams), Zack Follet (Lions), Evan Moore (Browns)

Pre-Week 3: Anthony Bryant (Redskins)

Week 3: Cory Redding (Ravens), Jason Trusnik (Browns)

Week 4: Jordan Shipley (Bengals)*, Willis McGahee (Ravens), Asante Samuel (Eagles)*, Riley Cooper (Eagles), Sherrod Martin (Panthers; was fined for Week 1 hit on Kevin Boss), Tony Scheffler (Lions), Jay Cutler (Bears; allegedly the fifth in his career)

Week 5: Aaron Rodgers (Packers)*, Darcy Johnson (Rams), Jacob Bell (Rams), Landon Johnson (Lions), Demaryius Thomas (Broncos), Rocky McIntosh (Redskins)

Week 6: Josh Cribbs (Browns)*, DeSean Jackson (Eagles)*, Dunta Robinson (Falcons)*, Mohamed Massaquoi (Browns)*, Husain Abdullah (Vikings), Chris Cooley (Redskins)*, David Garrard (Jaguars)


Pretty brutal video of some of them at the link.