TISM (an acronym of This Is Serious Mum) are an Australian alternative rock band from Melbourne.

The true identities of the members of TISM have been kept secret. For this reason, the band often appear in balaclavas when they play concerts, although they have also been known to indulge in ridiculously complex costumery to the same end. They have been thought to have been influenced by The Residents in this regard.

Numerous rumours have arisen as to why the members of TISM do not reveal their identities. One of which is that due to the highly controversial nature of their lyrics, if people were to know their true identities they could risk legal action. Another is that they are all, in fact, school teachers and need to keep their reputation in check. The latter theory is supported by the fact that the band's tour dates virtually always coincide with school holidays.

The band members have created pseudonyms for themselves.

Current known members include:

* Ron Hitler-Barassi: Vocals

* Humphrey B. Flaubert: Vocals

* Tokin' Blackman: Guitar

* Jock Cheese: Bass

* Eugene de la Hot-Croix Bun: Keyboards and samples

* Jon St. Peenis: Saxophone

* Les Miserables: Dancing

Past members are:

Genre B. Goode

Leak Van Vlalen

Tony Coitus

Steak and Charles Kidney

Hits include:

(He'll Never Be An) Ol' Man River

Greg! The Stop Sign!!

Everyone Else Has Had More Sex Than Me

All Homeboys Are Dickheads

Whatareya

Thunderbirds Are Coming Out

On the 9th April 2008. James "Jock" Paull died after a 15 month battle with Lung Cancer. Jock was the guitarist with the Aussie legends for 16 years. Jock was 50 years old.

R.I.P Jock

Tism No Mistakes Tour

Performers