One of my coworkers is fond of using ternary expressions instead of "if" blocks. Even ones without an "else". So I see things like:
condition ? someVar = "blah" : null;
or
condition ? doSomething() : null
Which should both just use "if" statements. Or my favorite:
condition ? someVar = "foo" : someVar = "bar"
which should really be
someVar = condition ? "foo" : "bar"