Do you really want to send Withnail a message saying you like their work?
A subset of emoticons, arsecons are used in email communication to describe the condition of an arse:
Normal Arse = (_!_)
Lard Arse = (__!__)
Tight Arse = (!)
Sore Arse = (_*_)
Slack Arse = (_o_)
Need help? email@example.com