Suggestions for 9yo boy please !

[Slinky]

DD1's friend is having a party on Sat. I'm OK with presents for girls but haven't got a clue what 9yo boys are into

Any suggestions??

yu gi yoh cards
playstations

nose picking
chocolate

Going on my Dbro and his mates:
cards (yu-gi-oh are faves)
Lord of the Rings stuff
Harry Potter stuff
those horrible alien things that squirt jelly everywhere (the mum might not be so pleased)
Football related stuff

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oooh lots of suggestions, thank you!

Off shopping tomorrow so will take this list with me