Definitely one of the best tricks to pull on your girl or friends.. When you have some time alone with their phone, change their ringtone to something horribly embarrassing, that would make people wonder what's wrong with them when their phone rings..

Any songs or ideas come to mind?

I Like Big Butts and I cannot lie.....

Sith actually gave me a better one. I change their auto text to other things, now thats fun!!!!

Wirelessly posted (BlackBerry 9000 4.6.0.67)

Yep autotext is the way to go. My favorite, change 'and' to a random phrase.

These sound like fun...I want to join.

How about putting a *interesting* picture that is sure to shock someone on your phone, and name it something like "horizon" or "mountains" and then send on e-mail (BB Messenger would also work, but it shows the thumbnail).

You could also use less hassle and send them the ringtone since they'll probably play it to see what it is and it'll blast around them...

i saw a couple in the tmobile store, and the wife was screaming " do not change mey damn ringtone", so just be wary.

You know what's fun? Going to a retailer like best buy and finding laptops without passwords, and adding a password to the admin account. then lock it. those kids have no idea what to do....

Of course, you can change the ringtone to Rick Astley's "Never Gonna Give You Up."