It never stops being funny. Guy Ritchie is almost like a European Tarantino here: the plot is rich and funny, the movie looks great and is cut well, the story line is non-linear, and the actors are very, very well chosen. Vinnie Jones was especially good, and I have a lot of admiration for Brad Pitt for managing that accent.
Aaand I first posted this review on Lock, Stock! I must've been spontaneously drunk. But that does remind me that I do tend to confuse these two films in my head. I hope I'm not the only one that does that... Because I think they are a little too similar, and Ritchie tends to repeat himself.