Well. My worst nightmare eventuated. 
The daycare drop-off:
Started off smoothly, then Subject became a little unsettled when I made noises about leaving. But I did the 'strong mother' thing and walked out (by now there were tears; his, not mine!!).
Half an hour later, back at home:
Couldn't help myself... I had to call the centre and check on him. Apparently a rather substantial tantrum had ensued, complete with the usual toy throwing. Did I dare show my face back there again? We'd reached a milestone. My son had thrown his first hissy fit in public. And I wasn't even there to witness it!
End of day:
Thankfully it all ended in smiles. Enough to make me take him back next week :-)
Footnote: two days later, runny nose runs riot.
Until next time, may your sleep be peaceful,
x Meagan x