Sharon Tate died at the hands of Charles Manson in 1969. Lindsay Lohan is raising many eyebrows–and rightly so–for dressing up like Sharon Tate on Thursday, which was Charles Manson’s 81st birthday.

What the heck was she thinking?

“#cancer meets #AQUARIUS I LOVE SHARON TATE #themeLOOK ?????????#hippieWINTERCHIC @lavishalice #tagoverload,” Lindsay Lohan captioned an Instagram post of herself dressed like the late actress.

A photo posted by Lindsay Lohan (@lindsaylohan) on Nov 12, 2015 at 2:05pm PST

Sharon Tate died on August 9, 1969, when members of Charles Manson’s cult broke into her home in Beverly Hills and stabbed the 26-year-old actress to death. Sharon Tate was pregnant when she died.

Manson is in prison, serving nine consecutive life sentences at California’s Corcoran State Prison.

People responded to Lindsay Lohan’s bizarre post in a couple of ways. Some assumed she knew it was Charles Manson’s birthday, while others hoped she didn’t know, and that her game of dress-up was nothing but a fluke.

Seriously hoping that Lindsay Lohan didn't realize it was Manson's birthday. #SharonTate

— Michelle Smith (@abacab81) November 13, 2015

Lindsay Lohan dressing up as Sharon Tate is bizarre. What a strange way to commemorate a terrifying act of evil.

— Dan Moran (@1DanMoran) November 13, 2015

Seriously, Lindsay Lohan? What kind of sick mind do you have when it comes to dressing up like Sharon Tate on Chuck Manson's b-day? #smfh

— XTiN@ (@FluffyNutterz) November 13, 2015

Lindsay Lohan doing something tactless & tasteless to get attention? yawn ok. Not worth clicking. Why can't these rich kids be more useful?

— Holodoc / Holocluck (@HolocluckHenly) November 13, 2015

WHYYYY LINDSAY LOHAN WHYYYYYY

— Vera Papisova (@VeraPapisova) November 13, 2015

If there was a good answer to the last Tweet, then there would be answers for many of the other bizarre things Lindsay Lohan has done throughout the past few years. Dressing up like Sharon Tate just drives home the fact that the young, troubled actress doesn’t have her act together–and may never have it back together again.

What do you think about Lindsay Lohan dressing up like Sharon Tate on Charles Manson’s birthday?

What the heck, Lindsay?