I have a lesbian friend named Cynthia that I pants sometimes as a prank. She tries to act like the butch tough girl but is actually really shy. She's Asian, and very pretty (though since she's gay she doesn't wear makeup or anything), with a lot of muscles from outdoorsy sports.
The first time I pantsed her was when we were going grocery shopping. She was in maroon sweatpants. As I was walking past her in the aisle, I just suddenly had the urge to pants her, so I did. I grabbed the sides of her waistband and jerked the sweatpants down. She didn't have on any underwear underneath (she was completely shaved, in case you were wondering). She just whispered "Shit!" and crouched down and pulled the pants up. I don't think anyone saw, since we were the only ones in the aisle. She blushed continuously and didn't say much the whole way back.
Another time I pantsed her while we were playing Guitar Hero. She was wearing sweats again. This time I got her from behind, and again she wasn't wearing underwear. She yanked up her pants and immediately came after me, trying to punch me in the nuts. Unfortunately she succeeded! A painful price to pay.
A third time, I pantsed her while she was cooking. This time she was wearing a black thong. This time she just threatened to get me in the nuts again, but didn't do anything.
Another time I tried to grab her bottom while she was wearing a bikini, but she dodged out of the way too fast. I think usually she was able to avoid my pantsing attempts.