Would you be willing to answer a few brief questions about PlayStation Forums?
Pay their mortgage for as many months as you can afford......
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Try something Nostalgic, even though parents like to keep up with technology, they get a lot of joy from things that remind them of the past, at least my parents do.
Try something like tickets to a show, or a comedy club... a night on the town.
alright thanks everyone, you've given me some more ideas to think about