#3

#3 Standing in Paris on an bridge and people waving

you need to be a little bit self-confident but it makes a lot of fun when you stand there, maybe with your best friend, and every time a boat comes, you starts to wave your arm like an idiot. 

some people will ignore you. but the most will laugh and wave back. and there's nothing better than getting a huge smile :)

and it's better you do that in a different town, so you don't have to think who might see you. i chose paris. just because i like it. 
of course, you can choose a town yourself.