stumble into something

Looking for a major, he stumbled into the history of science department.

I stumbled back and out, through a side door into the street.

Her second, a man she had never seen before, stumbled into the waiting room.

Just what had they stumbled into the middle of, here?

Others stumbled into the arms of their women like lost children.

She held out her arms to him, and he stumbled forward into them.

Should we stay until she stumbled out of bed into the living room?

We must have stumbled into a big party coming up the river from the south.

She did the same for another who stumbled into her a moment later.

Paul and I stumbled into each other on the way to the kitchen.