The Bad Thing is one of the few untabbed Arctic Monkeys songs. I've been waiting for a 
but have now decided to make my own. Hope it works out for you! At least it's the best 
yet ;)

G|------------------------------------------------|
D|------------------------------------------------|
A|-7-7-7-7-7-7-------------------------------9-9-9|
E|-------------7-7-7-7-7-7-5-5-5-5-5-5-3-3-3------|

G|------------------------------------------------|
D|------------------------------------------------|
A|-7-7-7-7-7-7------------------------------------|
E|-------------7-7-7-7-7-7-5-5-5-5-5-5-3-3-3-2-2-2|

Pause for the bass, until 'I've been before, with all these...'

G|-------------------|
D|-------------------|
A|-5-5-55-5----------|
E|----------5-5-55-5-|

G|-------------------|
D|-------------------|
A|-5-5-55-5--------7-|
E|----------5-5-578--|

G|-------------------|
D|-------------------|
A|-5-5-55-5----------|  3x
E|----------5-5-55-5-|

G|-----------------------|
D|-----------------------|
A|-1010101010101010-99999|
E|-----------------------|
10's, not 1's and 0's.

Second Chorus is a bit different.
G|-----------------------------------------------|
D|-------7-5-------------------------------------|
A|-7-7-7-----7-------7-5--------------------9-9-9|
E|-------------7-7-7----7-5-5-5-5-5-5-3-3-3------|

G|-----------------------------------------------|
D|-------7-5-------------------------------------|
A|-7-7-7-----7-------7-5-------------------------|
E|-------------7-7-7----7-5-5-5-5-5-5-3-3-3-2-2-2|

Verse, might be double notes.
G|-----------------|
D|---------7-7-7-7-|
A|-5-5-5-5---------|
E|-----------------|

G|------------------|
D|---------7-7------|
A|-5-5-5-5---------7|
E|-------------578--|

G|-----------------|
D|---------7-7-7-7-|
A|-5-5-5-5---------|
E|-----------------|

G|-----------------|
D|---------7-7-7---|
A|-5-5-5-5---------|
E|-----------------|

G|-------------------|
D|-------------------|
A|-5-5-55-5----------|
E|----------5-5-55-5-|

G|-------------------|
D|-------------------|
A|-5-5-55-5--------7-|
E|----------5-5-578--|

G|---------------------|
D|---------------------|
A|-5-5-5-5-5-----------|  3x
E|-----------5-5-5-5-5-|

G|-----------------------|
D|-----------------------|
A|-1010101010101010-99999|
E|-----------------------|
10's, not 1's and 0's.

Final verse (And then the first time it occured...)
G|------------------------------------------------|
D|------------------------------------------------|
A|-------------------------------------------9-9-9|
E|-0-0-0-0-0-0-7-7-7-7-7-7-5-5-5-5-5-5-3-3-3------|

G|------------------------------------------------|
D|------------------------------------------------|
A|------------------------------------------------|
E|-0-0-0-0-0-0-7-7-7-7-7-7-5-5-5-5-5-5-3----2----0|

And that's it. You may want to expirement with how to play the notes during the chorus - 
usually try 7-77-7-77, if that makes any sense.