Ah, I finally feel welcome.
Yeah, good point Mario Maniac. Bob-ombs have been popular in just about every Mario game after SMB2. Maybe Shigeru Miyamoto liked those particular enemies and attained the rights to them?
Also, how many different Shy Guy varieties are there?!? Around 50? Regular Shy Guys (various colors), Shy Guys on stilts, General Guy, Anti Guy, Sling Guy, Flaming Shy Guy, etc. Hmmm, maybe one day when I'm REALLY bored I'll take the time to make an estimate.