How many verbs can you think of that ONLY work with plural subjects? Subjects like "we" or "they" (or "you" plural). I can only think of two. They're inside with a spoiler warning, 'cuz this is obviously such a fun game and you'll all want to play ;-)
→[More:]
.
.
.
.
.
.
.
.
.
.
.
.
.
"Swarm" and "Flock" are my two answers. You'd pretty much have to have borderline personality disorder (w/ multiple personalities) to say, "I swarmed over to the beach yesterday."