my worst streak was only 220 at 50nl.
This was in one day (i actually had made 100 before i lost all this)
hands were if i remember
one buy in AA vs KK (opp hits quad kings on flop)
one buy in straight vs flush (i flop straight, opp has oesd that hits 4 flush on river)
one buy in set vs flush (same again tpgk vs flush he hits river 4 flush)
one buy in set over set (this is always a beat)

All happened in about 4 hrs where i took a bit of time off between each buy in dropped. All these calls sucked but i guess for the amount of money i have won of people making the first 3 calls i had to say fair enough to a few beats.