If your dad already has one, a backup battery charger is an okay, but a not so great gift, as he already has one. There are much more creative gifts, such as new wallets, laptop cases, or even cruise tickets!
The best way to convince your dad is to get him some thing, or do some thing great for him, for example, You take your dad on a vacation, or buy him some thing. But if that doesn't work for you or your dad you can prove you love him, or if your trying to get a pet but you already have one you can prove to him you deserve another pet by being very responsible. That's always the best way!
dont get porn, its rubbish. to get the best thing for you talk to your mum/dad
make a list of things that your moms like then you can by her a wonderful gift for anyone like your mom and dad
"make them proud"
The best thing to do is stay near a toilet and buy diarrhoea pills
A Playboy
Whatever you wish.
buy a fanta multipack!
The best thing to do is buy the codex
computer
Shinee's albums
Best Buy TV does not seem to be an actual thing however best buy does have its own channel on the YouTube website. Best Buy is also trying to increase online sales of the variety of electronics available in their stores.