Give a Guy Kettle Chips, Get Robbed at Gunpoint

Looks like there is a slight uptick in gunpoint-robberies in the Mission.  Mission Loc@l reports there was a robbery at 2:23 last Thursday morning.  A tipster also tells us this tale from Thursday afternoon:

I got robbed by a dude with a gun at the laundromat at 20th and Guerrero, at around 6 pm.  We were both hanging out at the laundromat for like 45 minutes, me waiting for my stuff to dry and him I guess working up the nerve to rob me. About 15 minutes after I got there he came over and said he was hungry, so I gave him the bag of kettle chips I was eating. He didn’t look or sound very threatening. But what do I know, because about 30 minutes after that he pulled out a gun and told me to put my purse on the table and get on the floor. Like I said, there was no cash or anything valuable in my bag ( which I tried to tell him, but he just threatened to shoot me).

Description of the above robber? “tall, very skinny, sort of hungry/stressed out looking black guy, maybe late twenties?”