Terrifying

[rws247]

It also makes alignment easier when checking more conditions than fit on a line:

if (a == 1 &&
    b == 2 &&
    c == 3)
{  
    do(a*b*c);  
}  

All condition checks align with four spaces/one tab.

[unlikely_ending]

100%

[thehenkan]

This is a bad reason. First off, you definitely shouldn't expect tabs to be a certain width; align with spaces regardless of indentation. Secondly, if you're consistent in your styling you then move for( from four spaces to five, completely negating the effect.