A woman walks into a sex shop and asks the man at the counter, "D..d..d..do y..y...you hav..hav...have vi..vi...vibrators?", she says stuttering

"Why yes, maam, we do."

"D..d...d...do you hh...h..ha..have th...the b..b....bbig ones?"

"Yes maam, we do."

"How d...d....d...do you t...t...turn them o..o...off?