Microsoft CD-ROM cases (jewel cases) were cool. There was this huge red sticker applied on it which said you wil agree to all terms and/or could not refund te product if this sticker was damaged.

Normal human beings had to tore the sticker in order to get the CD-ROM and install Windows, so they automatically 'agreed' to the TOS.

Until it was found out you can actually open a jewel case at the other side by carefully disonnecting the little plastic lids on the other side, thus never damaging the sticker.