Man, that's the 2nd post about me copying someone else's subject? I didn't see it!
Mushrooms slide on the ground because... The bottom of them are all slippery and move around. or, my far-fetched explanation:
They are Toads inside costumes!
Yeah, why does Mario wear the same outfit every time? I think a good explination is that from paper Mario, in Peach's Room (You know, Peach's Dress wardrobe), is like Mario's closet. Another one is from SMRPG (Mario's Pad, the walls).
I've answered my own mystery!
Q:"Why does Wart have a veggie machine if he hates veggies?"
A: He's practicing his aim with them!
Q:"Why does Bowser have an axe at the end of his bridges in SMB?"
A: So he can cut off the route to The Mushroom Retainers in case of emergency.
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An extremly rare and valuable Yoshi!
"Who want''''s to buy a gold Yoshi? Selling Price, $99,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999,999!" (almost 10 Googols!)