1.
400NL, 5max.
Reraised preflop pot (BB with full stack was the reraiser), I have OTB,
Flop comes:
BB bets, UTG shorty pushes AI, I push too, BB calls.
UTG has , BB has
A heart comes on the river, bye-bye a stack.

2.
Then I lose a stack when a fish hits a flush against my set of K, though there was partially a bad play from my part involved.

3. Then I lose to shorty, who had 130$, AI preflop, I had , he had , he hits a flush.

4. Then I lose 120 to a 4outer, when 2 pairs rivers a full against my nut straight.

And after all this I somehow managed to pull a small profit of 150$.

The last hand that put me in the green for a day:

OP is an aggresive fish who already did a couple of small suck-outs on me. He has 290, I cover. (400NL, 5max)
Preflop: I have AA, UTG raises to 14, I make it 35, folded to him and he makes it 66, I raise again to 99, he pushes, I happily call. He has AKo.

Disclaimer: normally I don't play AA this way, but against this particular player I felt there was a good chance that he'll get involved into a pissing contest, hence this minraise.