Just in case you missed it, AT&T tried to charge MythBusters star Adam Savage $11,000 for a recent trip to Canada for roaming. It had to do with the wording in their contract that says roaming data will be charged at ".015 cents, or a penny and a half, per kb" AT&T seems to have gone to the same school of math that Verizon did a few years ago where in their strange carrier world, .015 cents = a penny and a half.
In other related user ticking-off news, Rogers Communications in Canada is going to start charging users 15 cents for incoming text messages, though if you have a text plan, you probably won't be hit by that charge.