I figured out the piano. I'm 99% sure it's like this:
Intro, verse and outro:
e|---------------|
B|---------------|
G|-11-11-11---11-|
D|-11-11-11---11-|
A|-9--8--9--8-9--|
E|---------------|
On piano I think it sounds better like this:
e|----------------|
B|----------------|
G|-11-10-11-10-11-|
D|-11-11-11----11-|
A|-9--9--9-----9--|
E|----------------|
(you can also change it to this in the rest of
the song if you want)
[ Tab from: https://www.guitartabs.cc/tabs/g/good_charlotte/the_truth_tab.html ]
Chorus:
e|----------------------------------------------|
B|----------------------------------------------|
G|-11-11-11-11-8-8-8-8--11-11-11-11-------------|
D|-11-11-11-11-8-8-8-8--11-11-11-11-11-11-11-11-|
A|-9--9--8--8--6-6-6-6--9--9--9--9--11-11-11-11-|
E|----------------------------------9--9--9--9--|
I think the bridge goes like this:
e|-----------------------------------------------|
B|-----------------------------------------------|
G|-11-11-11-11-11-11-11-11-8-8-8-8-8-11-11-11-11-|
D|-11-11-11-11-11-11-11-11-8-8-8-8-8-11-11-11-11-| x2
A|-9--9--9--9--8--8--8--8--6-8-6-6-6-8--8--8--8--|
E|-----------------------------------------------|
If you disagree with this, e-mail me on elgitarus@hotmail.com