Now that I think of it, yeah you're right. That does happen. I'm surprised I never thought of it. lol. The same applies to baby yoshi (stays on the floor by himself, floats as soon as you pick him up)Unless I remember incorrectly it happens in Super Mario World? I'll test it out later...
Yea but as baby Yoshi is an animal you could kind of maybe expect that behaviour; like he physically does something when he gets touched (ah hem) that makes him float. Can't think that works with inanimate objects though.
I'm thinking too hard about such a trivial matter...