You say it like this:
"Gosh, a skateboard, really? Wow, you know our insurance will not cover accidents on party jumpers, trampolines, pogo sticks, and...well, skateboards! Man, too bad! Thanks for thinking of her, though. How about getting her a (fill in with acceptable gift.)"
Your MIL sounds like she must be related to my MIL
I had actually run across it on youtube. It was one of the deciding factors for me in getting it, DS was entranced watching the kids play with it.
I need to check that out. Did they have any that was candy or gingerbread themed? I got some super cute gingerbread paper at Walgreens in one town, went to a Walgreens in another town and they didn't have it

I found some peppermint paper that was cute but not
super cute.
Wow! You did get lucky! What is a WAGS? I need to get to Justice. DD wants a Justin Beiber shirt and I wanted to check out the MH stuff, too.