Pretty clever.
It's awesome that this flash was less than thirty seconds in length, yet it packs so many laughs. The punchline was funny, and I enjoyed Strawberry Clock's reaction to the bad news. I thought the animation was good, I like how you drew the Clocks using your own style, I found that to be creative. The music at the end also emphasised Strawberry Clock's sadness, I found that to be hilarious.
I didn't think that length was an issue, but it just seemed like there was not enough dialogue or elaboration. I'll admit, you had a funny one-liner going there, but if you extended the situation I'm sure the flash would have been even funnier, maybe even a comedy gold mine. Still, I found this to be very funny. Keep up the great work and have an awesome Clock Day!