Found couple of funny 4x4 tsumego from Cho U, 9p.
Both black to play, naturally.

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Other than resignation…

problem 1

B2, w B3, C3, if w C1, D2

problem 2

C2, wC3, B1, wC1, A2, wA1, C4, w B4, B1, wC4, C2, w has no moves, so b plays A4 next.

(Thanks to @S_Alexander for pointing out my mistakes)