Laughing during clitoral stimulation

I have no idea why, but when my SO gives me clitoral stimulation (with his hand) for whatever reason it makes me laugh.. almost like it tickles. Don't get me wrong it feels GREAT! But instead of moaning I'm busting out laughing. 
Does this happen to anyone else? I feel like I'm almost putting him down when it happens which is not the case.. I just don't know how to keep from laughing 😞