While loading content from another page, if the <script> tag contains any capital letters, the script will execute while loading. Even if the script is outside the target content. I posted a detailed description (as Fudgey) at Stackoverflow (http://stackoverflow.com/questions/1821047/very-interesting-jquery-load-behavior-a-bug-or-solution) and it includes a fix by user Jitter.

In jQuery 1.3.2 line 3272 should look like this:

.append(res.responseText.replace(/<script(.|\\s)*?\\/script>/gi, ""))

all that was added was the case insensitive flag.