The worse I find is when they fall asleep in the shops just as you are getting ready to get to the car and then you have to either stay or wake them up to put them in the car.
Oooh the amount of times I've had to stay for aaaaaaaages because of that and nothing to do but wander aimlessly...lol.

As for going to the toilet with bubs in a sling well actually hugabub, yep done that. I found it quite similar as trying to go when heavily pg except bubs is on the outside..lol. I don't get to go on my own much any more anyway..haha.