oh yes. My DS2 is 2.5. He petrifies me. When DS1 was little, he was mega-active, but he didnt do particularly dangerous things (and when I say that, I mean relatively -all toddlers do dangerous things some of the time LOL - its part of being a toddler - I realise that) He calmed down when he hit 2, and is a bit of a couch potato now. Part of me is relieved about that!
DS2 lulled us into a false sense of security by being a mega-happy chilled out baby. He ramped up at 10 months (when he started walking) and basically hasnt stopped since. He is such a gorgeous little boy - he is just delicious and so gentle and caring (he is well into cuddly toys - DS1 wasnt interested). BUT he has been into vacuum cleaners for about 10 months now - his favourite thing is to go to the 'hoover shop' (tesco electricals dept) at the weekend. He likes to dismantle them. He knows how to plug them (and anything else) in and turn them on. He likes to make hybrid hoovers out of various bits from the house, including the phones.
The other day I found him in the kitchen having moved the stool over to the oven. He'd removed all the oven shelves and was filling the oven with tupperware from the drawers. Thank GOD the oven hadnt been used recently. He can also work the microwave and the tv (dvd, virgin box, ps2). He loves to climb shelving. The other day I asked him to get his changing mat for a nappy change, and instead, he climbed up the radiator, lay down on the windowledge and put his legs in the air, which was hilarous but... worrying! especially as he was hanging onto the blinds for stability.
He thinks he can do anything the older boys can do, and like many kids has absolutely no fear - when swimming he will take off his armbands and leap in the pool knowing full well that he'll sink..
he does has moments when he'll be still - if we're shopping I have a small window - but I must feed him during this time or he'll be out of the shopping trolley in a shot. Recently he's started watching shaun the sheep and I can get him to sit still for a good 4 episodes - thats 7 minutes each!
He is a runner wrt roads - but he's 2 - so I just hang onto him and let loose when theres nothing moving nearby. He petrifies me on his little bike because he goes so fast and I have to sprint to keep up!
So yes, he scares the wits out of me!