BOSTON (CNN) - Police say a "serial tickler" has been sneaking into houses and accosting people while they're sleeping.
The bizarre home invasions don't involve any theft, just tickling.
"He had felt something on his foot, thought it was the cat, and he woke up and looked over, and the man was crouched right by his bed," said David Master, the victim's roommate.
The tickler, or a reasonable facsimile, hit again Tuesday morning.
"My roommate woke up screaming, and there's a man in his room," Master said. "And he had tickled his foot and was crouching by his bed."
Detectives assumes it was the same guy each time. The tickler has hit many times before.
His best cover is the element of surprise.
"I had just woken up. I didn't get a good look, couldn't see him," Master said. "He looked like a tall, skinny guy."