Custard

Today I had some custard
But it didn't cut the mustard
Though I really thought that it would be the best.
Guess you can't make an assumption
Based on ice-cream loving gumption
That what looks impressive must leave you impressed.

So the next time I'll be cautious;
Though this didn't make me nauseous,
It was mediocre and not up to snuff.
A prediction's surely wasted
'Cause until your tongue has tasted
All that other information's not enough.