Sorry. That grumpy pie comment was totally non-toddler related (tho I really do want pie!)
I have a nephew who was a little over 3 & still not potty trained. His parents just didn't want to deal with it. When he was here, we'd set the oven timer to go off every 60mins. When the beeper went of we'd make a big deal about it yelling, waving our arms & running as fast as we could down the hall to pee. We'd sit there for about 5 mins then set the timer again. It was kind of a pain for me, but a lot of fun for him & his mom was always shocked that he'd be wearing the same clothes & the same pull ups when she'd pick him up.
Seriously, before we started doing this, she would put a handful of diapers & two changes of clothes in his bag. By the time she'd pick him up, he'd have pee'd/pooped thru both changes of clothes & be wearing a pair of DD3's clothes.