Unfortunately for my first boyfriend over 10 years ago he didn't believe me. So he decided to wait till i was asleep and get on my legs and tickle my feet. Well.. He didn't hold me down tight enough and i jerked and well it was a REFLEX and i just kicked out and sigh..
.. cracked 2 of his ribs with my other leg
I felt really bad about it and he never let me live that down. Always joking around later on in the relationship he'd say things like "YES DEAR! Lordie knows i shouldn't ever say no to you! I might end up with another cracked rib!" It was in jest and we both kind laughed about it but i still felt really bad that i hurt him.
Word to the wise! Don't tickel someone that's ticklish when they're sleeping!