Standing very close to doors and waiting for someone to open them so you're right in their face.
It's good fun though.
( Noit happy baby orangutan, Tue 4 May 2010, 14:54, archived)

Similarly holding two pints and brushing very close at the bar (excuse me sorry pardon me ooh hello)
Hilarious fun with the easily-embarrassed.
( spangolin - the odds are good but the goods are odd, Tue 4 May 2010, 14:55, archived)

For some reason I pictured Hugh Grant in that scenario
that speaks volumes
( Two Hats 🎩🎩, Tue 4 May 2010, 14:59, archived)