On Leil Pesah (the night of Pesah) Hasebah (leaning) is required when eating the Masah and drinking the Arba' Kosoth (four cups of wine). This is to show Heruth (that we are free people). Normally one would bring comfortable cushions that we could lean on.
The question is, what if somebody leaned on the shoulder of the person who was sitting next to him. Is this considered to be Hasebah (leaning) or not, since this is not the way a person would lean in order to show his freedom?
The answer is that this form of leaning is considered to be Hasebah.
(See Torah Lishmah, Sheelah Qof Lamad Heh)