Guilt and Shame

After a hedonistic night, Robbie and Gabe just want to perform their Fringe show, but previous excesses keep showing up at the most inopportune moments. A moralistic drug dealer clamours to impart her addled wisdom over sketches which get increasingly filthier and funnier until the only logical conclusion is either pornographic mime to Justin Bieber or a spot of murder.

The Caves, 556 5375, until 28 Aug (not 17), 10.15pm, £7–£8 (£6–£7).